Are NA and NB seat belt clasps interchangeable?

davekmoore · Postby **davekmoore** » Mon Jun 23, 2014 2:02 am

My Sparco Sprint seat has NB rails with the triangular fitting for the seatbelt clasp but presently without the seatbelt clasp fitted. I want to be able to use the normal seatbelt with the Sparco for the few times I use that combination on the road as using the full harness is a) a pain and b) dangerous without also putting the full helmet and HANS on.

So can someone please let me know if the NA clasp (as below) will attach to the triangular fitting on the rail and if it will accept the tongue from the NB/SE seatbelt?

http://www.ebay.com.au/itm/Mazda-MX5-Mi ... 2c84cd5825

Or, does someone have an NB clasp for sale?

davekmoore · Postby **davekmoore** » Mon Jun 23, 2014 3:08 am

Thanks. More concerned about whether the male part fits the female part as I'd be fitting the NA female part to the triangular part of the NB rail thus enabling the clasp to be above the taller sides of the Sparco seat.

emily_mx5 · Postby **emily_mx5** » Mon Jun 23, 2014 10:02 am

I've had nb8a and nb8c seats (thus rails/receivers) in my na8 and all buckles/clasps/tongues worked perfectly. This is the opposite of what you would be doing, but that means yours will work.
From memory the hole size is pretty big on both na stalk and nb rail, so it might actually bolt straight on haha.

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93_Clubman · Postby **93_Clubman** » Mon Jun 23, 2014 10:57 am

booerns wrote:I may be completely wrong here, but on an NA the seat belt clasp is bolted onto the side of the transmission tunnel, not any part of the seat or the rail, so I'd assume it will not be fit for your purpose.

NA6 seatbelt stalk bolts to transmission tunnel, but the NA8 seatbelt stalk mounts to the side of the seat.

Snowmotion · Postby **Snowmotion** » Mon Jun 23, 2014 11:52 am

The only issue may be that the buckle is longer than the NB and may sit too high on the seat when mounted to the seat rail.

Skinny Jim · Postby **Skinny Jim** » Mon Jun 23, 2014 1:34 pm

na6 female clasp does not fit with nb8a male buckle. it will not engage. thats the extent of my knowledge but its first hand. i put nb8a seats in my na6 and had to change the seatbelt reels as well.

hks_kansei · Postby **hks_kansei** » Mon Jun 23, 2014 11:07 pm

Skinny Jim wrote:na6 female clasp does not fit with nb8a male buckle. it will not engage. thats the extent of my knowledge but its first hand. i put nb8a seats in my na6 and had to change the seatbelt reels as well.

You sure?

I have an NA stalk and clasp in my NB, happily clips firmly into the NB seatbelts like stock.

Skinny Jim · Postby **Skinny Jim** » Tue Jun 24, 2014 10:47 am

is your stalk na6 or na8? mine is a very early '89 maybe they changed things later on . who knows.

Skinny Jim · Postby **Skinny Jim** » Tue Jun 24, 2014 11:08 am

or perhaps i only changed the reels cos the old ones were so old, sun faded and stuffed. and i got the nb8a ones for free out of bruce's race car. geez i dunno, it was a while ago :roll:

hks_kansei · Postby **hks_kansei** » Tue Jun 24, 2014 9:18 pm

Skinny Jim wrote:is your stalk na6 or na8? mine is a very early '89 maybe they changed things later on . who knows.

NA6 I'm pretty sure.

Not sure what year NA6 though, I know there were a few changes to the NA6 near the end of it's run.

datfreak · Postby **datfreak** » Wed Apr 29, 2015 9:21 pm

I thought id revive this thread.
I'm looking at buying some nb seatbelt reels to fit my 1989 na6

Will the nb male fit the na6 female socket?

The rest of the thread above is a little confusing if it will fit or not

hks_kansei · Postby **hks_kansei** » Wed Apr 29, 2015 9:24 pm

datfreak wrote:Will the nb male fit the na6 female socket?

I have an NB (a 1999 if it makes a difference)
I fitted an NA6 (1990) stalk (female)

Both the original NB belt (male) and the NA6 buckle (female) click together and work perfectly fine.

slug_dub · Postby **slug_dub** » Wed Apr 29, 2015 9:38 pm

93_Clubman wrote:NA6 seatbelt stalk bolts to transmission tunnel, but the NA8 seatbelt stalk mounts to the side of the seat.

For clarification, this should be:

NA6 seatbelt stalk bolts to transmission tunnel, but the NA8 seatbelt stalk mounts to a runner attached to the transmission tunnel and the side of the seat.

Good to know that NA and NB clasps and buckles should be interchangeable. I still haven't got a solution that I am happy with for putting the NB seats in my car yet.

datfreak · Postby **datfreak** » Sat May 02, 2015 10:01 am

thanks for the info. I just bought a pair of nb seatbelt reels to replace my knackered na ones. I will report back here after fitting them.

datfreak · Postby **datfreak** » Tue May 05, 2015 10:09 pm

Got the NB belts today. They have 1998 sticker/tag on them.

So in a 1989 NA6:
the NB male will go into the NA female clasp

the NB reel is slightly bigger then the NA and will not bolt up. A small modification is needed for the bolt holes to line up.

The NB reel does look more solid/ complex then the NA one, and is a upgrade.

Thanks for the info prior to buying these :beer: