Does one mount normally fail before the others on third gens? Just noticed RHS mount is cracked. How likely is it all 4 need replacing? Kelpro have options for some of the mounts (either complete mount or insert). They however do the LHS mount in rubber for the complete mount and only in PU in the case of insert. So if you goes for the insert on LHS, one will have 3 rubber mounts and one PU. Thoughts?

Cheers

Drivers side is the first to go. The gearbox mount on the passenger side is second, and the front and rear ones (roll stoppers) I have not had mine go and the car has done over 400,000k's.

drivers side mount commonly goes. its easy to change but if you do it DIY, its best to have a deep socket to do it
if you are talking about poly bushes(the pu ones) they limit the engine movement and you will most likely feel more vibrations...