Corsa-B.uk - Vauxhall, Opel and Holden Corsa B Owners Club

ok, im looking for a new clutch, the guy form the motor factors said i need the gearbox number, now i know the gearbox for my engine is an f13, but on the gearbox it says F3, does this mean its an F13?

The clutch would be for the engine?? the box will be an F10,13 or 15, maybe a 17 but the clutch is the same for all.