Restoring my 1970 Duster

Thanks for the positive comments !
Now I have some problems with overhauling the front disc brakes... the guy before me had installes two different brake calipers :violent1: and now I need this part with # 4574 A ( for one brake piston ) as a used part.
New pistons are here and also the seals and bleeders...can anybody help with such a caliper?
Thanks,
Peter