GTD rear disc size

On the “standard” (ie underslung caliper) GTD rear brake setup, what discs are used? I’m pretty sure they”ll be off the rear of a Granada, but were there different sizes of discs or were they all one size?
As always, any advice appreciated.
Simon
 

Malcolm

Supporter
Haven't changed them for a long long time but I thought the rear brakes were from a Granada Scorpio Cosworth? Might be wrong so don't rely just on my input please.
 
They will be Granada mk3 as mentioned, but will depend on the donor. Either 262mm non cosworth or (preferably) 273x20mm vented from the mk3 Granada Cosworth (2.9l 24v).
 
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