Phil,
I do not believe there are any off-the shelf equivalents.
It is very likely they are are the same as the 411 brake disc/rotors, which are a Girling 64327417 for the front.
The rear being 64327404. Not sure how the front and rear discs varied.
Now that Bristol Cars are no longer with us, it is important to get some certainty around parts information, otherwise we will end up with all sorts of different modifications as owners try to keep their cars on the road.
Kevin
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