Theres a post somewhere on here about this mate, quite recent too (have a search).
IIRC mine had no or a very very little gap between the top plate and the strut tower. I used new G60 top mounts (from GSF).They're easy to change, just drop the shock out and the mount usually sits on top, replace and hey presto. The top nut takes some ingenuity to remove/tighten however.
