Stop in for a cup of coffee

Ahhh... could be.. I'll have to find the part and see what they looked like.
here's one
https://www.forabodiesonly.com/mopar/threads/nos-mopar-block-heater.508696/
Probably weren't too many versions??

We just left the cord on all the time. Didn't use it much. My folks got it installed for ski trips.