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I am considering changing the OEM steering wheel on my NA8. It is the same steering wheel pictured in the link below.

http://i5.minus.com/ib11rZnXr.jpg

However, upon inspection with a tape measure, it appears the stud pattern of this steering wheel is approx 6x55mm, instead of the standard 6x70mm for Momo, Sparco, etc. I know this particular steering wheel is also OEM for some FD RX7's. Is this a one-off product from Momo? I guess I will still need to buy a boss kit?

My brother's NA6 also has the OEM Momo wheel, but with the normal 6x70 stud pattern....

Why don't you just remove your steering wheel and see if the standard boss has a bolt pattern to suit your brother's Momo? The NA6 Momo definitely has the standard Momo bolt pattern, so if that fits than any off-the-shelf Momo will fit.

When I removed my steering wheel I found that a previous owner had already fitted an aftermarket boss kit that has both Momo and Nardi patterns, so you never know what you might find!

are you measuring the faux hexes surrounding the horn button?

Yep, which is exactly why I'm posting here.

I'm was guessing there still is a normal momo boss underneath and that those bolts are simply for the horn surrounds/front cover. From yours and Emily's responses, it looks like I may be correct.

Anyway, I'll probably open it up tmrw and confirm everything. Just thought I'd post here to get a straight answer.

Well, after removing the wheel today, my suspicions are correct. This does NOT use a momo boss, in fact, no boss at all just like any typical OEM steering wheel. Which means that this is a one-off special from Momo for the NA8 and RX7.

Yep, the stud pattern I measured was for the horn surround, nothing to do with the mounting of the steering wheel.