AMT/Ertl kitted a Diablo back in the 1990s, and re-released it a few years later (1997? 98?) as a "Plus Pack" with glue and paint. I believe the original kit had a red car on the box front, and the Plus Pack release had a purple (!) one. IIRC, there was also an "Aero" version offered with added air dams, side skirts and other goodies. The Diablo kit was also released as part of a 3-kit-in-1-box offering called "Exotics", and came with a Dodge Viper GTS and a Jaguar XJ220.
The Fujimi offerings are far and away superior, although the AMT kit wasn't bad for its day.
Revell kitted a 1/24 SnapTite Diablo VT, a 1/24 glue kit Diablo and a 1/32 EasyKit Diablo as well.
Pardon my fuzzy memory, but I'm pretty sure Testors/Italeri also released a Diablo kit in the early 90s.
-YL