2.8RSR brake discs - sizes front & rear?

I can't find anywhere what discs the 2.8 RSR was fitted with in 1973.
All books & articles provide info on the calipers but not on the discs. The RS had ventilated discs, but the RSRs look larger and they were cross-drilled as can be seen in period pictures.
They also differed from the standard discs in that they were floating, as they had lightweight bell hats.
EB-Motorsport sells discs that they say are for the RSR and they are 300 X 32 front and 300 x 28 rear. Can anyone confirm that is correct?

thanks,
Patrick

Yes that is correct. Front rotors are basically 78-79 Turbo and rears are the same but 28mm (1 1/10”). Rear lug drive rotors are impossible to get, so they have to be made. I have a new single rear rotor, I’ve hade for years.

thanks for confirming.
I purchased the front & rear rotors for the 78-79 turbo and indeed, the fronts (930.351.047.00, 304 x 32) fit with the front disc bells I got with the Zuffenhaus brakes,
but the rear discs have the metal bell-hat fixed so that doesn't work with the light-weight bell hats I have.
The rear 'floating' rotors are hard to find.... and expensive; It's a lot of $$ for a 2kg weight saving for both discs.

https://historicdb.fia.com/ Should have brake dimensions for any car used in competition

U can also cheat and run front rotors on the rear ALU hats. U will have to come up with alternative E brake.
Not a good shot but bottom shelf, I run front rotors on the rear.

thanks again, I already purchased the RSR e-brake system so will probably have to find an alternative, but I did try to 'dry-fit' the front rotors with the rear hats.
Got the hats from TwinSpark Racing (suspect they're the same as EB-motorsport). Beautifully made. It's like with the calipers, almost a waste you hardly see them when fitted.
top of picture is the front rotor with rear hat, below is the standard rear turbo rotor (930.352.045.00).

Attachment 552626

Try the guys at Differs (ex TwinSpark) they sorted it out for my 2.8 RSR build. They'll have the info you need.
Joost or Leon - https://www.differsgroup.nl/en/