Hi.
I struggled to get a binding caliper sorted out to get my car to the 50th celebration the other year.
I bought discs and pads from EBC at the time.
Omicron engineering seem to have front discs in stock at the moment.
https://shop.omicron.uk.com/collections/betaI used Brake caliper solutions in Barwell Leics for the remanufacture of the original calipers. Fast turnaround, competitive price, good work (bleed nipples had previously broken off) to make all good.
I think you will struggle to find replacements calipers. Which is why I had mine remanufactured. You will also know they will fit the car having them remanufactured.
Clifford