NB. original post was asking about rear calipers with handbrake mechanism, so that's Scorpio Granada or Sierra Cosworth etc.
(Rears are drums on European Granada Mk1 & 2, and Cortina & Capri, apart from the Tickford.)
From memory I think Lucas Girling were the original suppliers of these type...
It was on a dealer stand, not the auction. http://www.totalheadturners.com/detail/ford-gt-40-284523
This company buy up dozens of replica Cobras, GT40's, Porsches, etc., to resell.
You can use the search function for many of the popular things that get asked, and there's a lot of really experienced builders on here who are always helpful with questions.
Plus in the UK there is the GT40 Enthusiasts Club too.
No it wasn't a GT40. (Fiesta ST & Ka) I still haven't reached the dizzy heights of GT ownership yet........
It's a small family company so perhaps you would like to email or phone them with your initial thoughts / questions ?
( You'll find Chris can talk all day about air conditioning...
This is the company I use, & have also done work on some of my colleagues vehicles. We've all been very happy with the service & advice we've received. Last time I was there they were sorting out the air con on an Ultima, they can build you a refridgerated van, anything air con or...