I recently bought a Zetec silvertop with a raceline flywheel. and want to mount it to a t9 gearbox.
The engine comes from a caterham, so the spigot bearing should already be the right one. Can I use another clutch and clutch cover than the original raceline one?

think its just a sierra one.
u2u damdy cash and ask him ....he will know

Depends on what's fitted currently! They are available machined for different sized clutches, including the small race clutches. If it has one of these the standard Ford clutch will not fit.