I don't know a great deal about these cars, but there is a totally complete 1989 Isuzu I-mark RS at the PAP East in Atlanta. It is all there; awsome seats, 10k tach, spoilers and spats, good dash (black, one crack), perfect door panels, perfect grille (solid), front bumper cover (cracked but fixable), rear bumper cover (perfect). It has the DOHC Isuzu engine and 5-speed trans in it. Has the Lotus badging.
I hope this helps someone.......... If you need parts, I may be able to get back out there.
-Les 770-778-7368