How similar are Mk2 top mounts to Corrado? There were Frazero ones made like that (and indeed VWM ones), and I know where there may (may) be some spare Corrado ones. The alternative is to unscrew the rose joint if it is threaded on to the damper stem, and put it through a normal-design top mount.
Ah, I get mixed up with these. Anyway... http://thmotorsport.com/index.php/th-motorsport-history.html Suggest to them they give Ken Lark a call