Last summer I installed disk brakes on my 14 bolt. I bought the "large GM" calipers from TSM (see http://www.tsmmfg.com/3120.htm), which are different from the cadillac calipers. I hope the "only available from TSM" is something I can work around! I have developed a leak around the parking brake lever stud, and would like to find the stock application so I can find a reman caliper locally. Do you know what these calipers are originally from? (or whether I can buy a rebuild kit for this one?) Thanks!