mounts, the escort ones for zetec from retro ford will probably fit even if you have to adjust rubber thickness(phone dave). or slice off tops of crossmember and make some chassis mounts.

sump...im not sure, it needs mods for escort fittment so probably will for capri,why worry just cut@n@shut it. you can put a wing in at same time.

water rail needs moving to fit in escort. check your rear clearance against a mk2..... if you got more it might fit but id guess they are similar, the crappy has got all the space at the front !

hope this helps a little.