At least one of the late model Chevy compact cars runs electric assist, and a couple of imports. You'd need to look for a very late-model total loss wreck, preferably with rear body damage. It would require a little research to see if one of those units might fit and function in your application. The sticking point would probably be whether or not a computer interface is required. Electric steering assist is the latest fad to avoid putting extra strain on some of the really small engines by driving a hydraulic steering pump in the subcompact cars.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!