Brake disc diameter/thickness

Hello folks… Is there any chart or has any of you got a link that shows excactly what diameter and thickness each of the models use … I am especially interested in what mine are in diameter/thickness on my 1991 GTO VR4 as I really struggle to find the needed information and I dont want to order the wrong size, especially in these times where transport seems to take ages.

For 1991 GTO TT 296 Front 284 Rear / 30mm

Is it same for N/A? (‘91)

I read somewhere that they are not 30mm at the rear but 20mm, is that correct??

Yes front and rear the same as TT

Yes the rear are 20mm, smaller caliper.

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Many thanks for confirming! :+1: