Yeah mate they are different, you can use a vauxhall let clutch plate as they have the same spline as the st, you just need a solid flywheel with slight modification, as for drive shafts, dave mac can do you a complete set of shafts with st and rst ends to fit the right c,v. Unless you go down the route of welding the two together. Oh and dont forget he speedo is electronic so that needs modifiying,

Cheers adam