I think there were six bolts for my gearbox altogether, and I think they were a 14mm head but Id have to look again to be sure, its actually fairly straightforward once you get under there and start looking about. the exhaust did kinda get in my way but all you need is a short extension on a ratchet and you shouldnt have any probs getting round it, I did have problems getting the g/box back on though, theres a metal plate that sits on dowels (youll see this when you get g/box off) and it kept slipping round and stopping me locating the box properly, oh and I hope youve got a clutch aligning tool, I didnt and oh my god! mission!