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I would like to avoid the white rectangle if I can.
I have seen black numbers on white cars and white numbers on dark coloured cars.
Cams says the competition numbers must be "clearly visible to the satisfaction of the Clerk of the Course" and the supp regs specify:
"They must be clearly legible to the timekeeper, and be of a contrasting colour to the surrounding bodywork"
My car is silver. Can i use white numbers? or black numbers? or maybe dayglo orange? or do I have to use a white rectangle and black numbers?

For speed events, CAMS specifies that the supp regs for the event will specify the requirements for competition numbers.
Your quote is from the NSW Supersprint supp regs, but the requirements may be different at other events.
The MX-5 Club supplies square magnetic numbers (black digits on white background) to entrants for the numbers 1 through 60 at club track days, and the supp regs state that where the competitor decides to supply their own numbers, that they "are to be clearly visible from at least 200 metres."

"clearly visible to the satisfaction of the Clerk of the Course" is from the CAMS manual.
"They must be clearly legible to the timekeeper, and be of a contrasting colour to the surrounding bodywork" is from the MG Newcastle supp regs.
I asked Lisa Drayton and she said black numbers on silver will be fine.
She also mentioned that the timekeeper cannot see the numbers on the doors at Wakefield, only windscreen numbers.

Nuddy, yes there is no problem with black on silver.
The white magnetic sheet is usually used on road registered cars to allow easy removal, reuse of numbers, & avoiding damage to paintwork.

I've been using boat registration numbering stickers which you can buy from BCF for $3 a pair. They are a little smaller than the CAMS regs specify, but I've not had an issue as yet.

The American wrote:I've been using boat registration numbering stickers which you can buy from BCF for $3 a pair. They are a little smaller than the CAMS regs specify, but I've not had an issue as yet.

CAMS specify 230 mm high. CSCA supp regs specify not less than 28 cm.
MG Newcastle sell them on the day for $2 each. I will buy them on the day for $8 total.

entry fee $220
Dorian hire $15
Credit card fee $4.70
Dorian Bracket $10
(once only purchase)
Numbers $8
Total so far $257.70

Nuddy wrote:CAMS specify 230 mm high. CSCA supp regs specify not less than 28 cm.

28cm is obviously a misprint. Should be 23
Good pickup, which no one else has noticed in years & years!

Maybe not a misprint!
Just checked all my race no's, old & new, bought from race shops, & they are 270-280 high.
But no one cares anyway. Have seen plenty of people modify a number, or add a 1 etc with black tape, at supersprints.
At Challenge Bathurst regularity last November, the organisers gave out the no's to all competitors. They were 190 high!

This is what the BCF numbers look like:

The American wrote:Numbered and ready for the next adventure

Are those BCF numbers easily removeable or (Longshot I know), reuseable?

Gladiator wrote:Are those BCF numbers easily removeable or (Longshot I know), reuseable?

Easy to remove, but I don't think you'd be able to reuse them - fortunately they are cheap

The American wrote:This is what the BCF numbers look like:

The American wrote:Numbered and ready for the next adventure

Lovely looking car.

I will see what MG Newcastle issue.

The American wrote:

Gladiator wrote:Are those BCF numbers easily removeable or (Longshot I know), reuseable?

Easy to remove, but I don't think you'd be able to reuse them - fortunately they are cheap

I re-used the numbers from CSCA. Just have to be careful removing them. Probably one reguse would be the limit.