I bought these calipers on eBay, before really knowing enough about the Metro conversion. I'll be at a stage where I'll be building the subframe up and putting brakes on soon, and just got round to getting these out of the shed. I don't think they are the turbo brakes, as the advert says non vented (my mistake being a noob). They are 4 pot APs.
I live around the corner from Big Red Brakes and was going to get them restored. Question is, should I bother, and can I use them, if they aren't the Turbo ones?