These calipers of the right year are hard to come by, but "luckily" found one on E-Bay described as "good working order".
Very dissapointed when it arrived as the sliding section was partially seized, and both pistons and seals were shot so not as described.
Had these not been so rare I would have demanded my money back, as it is I will have to fit new seals / pistons etc. The seized part was an easy fix.
This is the first time I have been "had" - waiting to see what the sellers response is to my negative feedback.