Hello Kurt, Series 1 cars were fitted with Lockheed H-Type calipers. Also listed as used on Austin A99, Princess 3 litre, and Wolseley 6/99, with slight variation. Lockheed nr. for 1x caliper seal-kit is SSB 2603. Piston nr. is 107638. Pads listed as LDB1.F0, FER 2430 F. Sold in axle-sets. Some Lockheed parts are still to be found (ebay etc.), but probably the best source today is Chris Prince. I purchased flex hoses, caliper + piston seal kits, and master cylinder from him, all were in stock, good and not overpriced. Check his website for all TD21 brake parts available. Be careful with bleeding after any brake work, it is not easy to get all air out of the servo parts (especially the reaction-piston). Binding of the front brakes is not unknown after brake-work. Have plenty of fresh fluid, bleed first with engine off, then again with engine running, test run the car, and bleed front brakes again (energetically) if any signs of binding have occurred. If in doubt about the servo, either overhaul it or replace it complete. An old servo will almost certainly have worn seals, may be working fine, but brake fluid can weep into the main chamber and cause rust problems + main piston-seal wear. Hope this helps, Giles Lacey Posted by lacey giles 22/08/2014 08:33:14