I didn't see them in the manual as well, plus they are not like any of my parts. just a thought, but the 427 was not their only product at the time. My bet is mixed in parts, probably from their "Badlands" Hummer H1.
"The Duchess resembled the MG TD and was based on a chassis of the VW Beetle .
The Saxon and Sebring was modeled on the Austin-Healey 3000 with the option for a hard top . He had a tubular frame and optionally a V6 engine or a V8 engine. A version with widened fenders was called the Sebring .
There was also a replica of the Mercedes-Benz 500 K .
The model Marlene was taken over by Bradley Automotive . He also resembled a Mercedes-Benz of the 1930s.
1982 followed with the Duke a replica of the Jaguar SS100 . The engine was either from Ford or General Motors .
A vehicle in the style of the AC Cobra was also in the range."
https://motor-car.net/usa/item/18273...20from%20Miami.
After some digging around the internet at all their models, Clearly they shared quite a lot, but I did not see any parts like those.