No Brian, I think I have found some reasonable second hand calipers. Didn't know the S1's had a disc handbrake. Out of interest why go back to drums? I take it the Dunlop caliper is problematic?
Neil pleased your sorted, Dunlop brakes have a pretty fearsome reputation of seizing and not being very good, but (hope I'm not tempting providence!) in the 12 years I've been running "Fay" and over 20,000 miles I've never had a problem, but and it's a big but, they must be kept well maintained.
I've been over the Alps and the Pyrenees and many thousands of miles on motorways running at 70mph with no problems in stopping, however I do leave a bigger gap between me and the next car, until some idiot jumps into it.
Why change, Fiat & Cost cutting
? I hate to think what the Dunlops cost to manufacture.
Brian 8227