I have a 1981 Caterham Super 7 with the 1.6 Cross flow. I'm currently trying to rebuild the brake master cylinder. It's the Lockheed Duel Circuit with the plastic wedge tank(casting #70-3211-426).What car did this originally come off of? And what is the correct rebuild kit for it? I'm also looking to replace the Spax Shocks, if anybody knows a reasonably priced substitute it would be greatly appreciated!!