[Goran]

I found two M8 threaded clevises that could work, instead of getting a £10+ brake booster clevis and having to cut it down and tap it to M8.

One may be too long:
http://uk.rs-online.com/web/p/gas-sp...ories/3120264/

this one looks like it could be just right:
http://uk.rs-online.com/web/p/gas-sp...ories/3473259/