Heuristics for that type of part: 'Phone Redline (and soon, I hope, browse as an alternative). Email Caterham rather than only browsing. (Is Darren still the best point of contact?) Car Builder Solutions. Holden. BLATCHAT!And on one of those specifics: It's "Dzus" (but you're closer than most, and most search engines will sort that out). The sizes (and there are at least two) and, IIRC, some sources are in the archives: let me know if you can't find them.Jonathan