Prestolite made ignition products for both Ford and Chrysler, not just Chrysler Corp.
Prestolite/Autolite supplied electrical components for a lot of the "orphan cars" that didn't make the stuff in house. You'll also find a lot of Delco (GM) electrics in orphan cars.
Exactly the reason I haunt all the local Studebaker swap meets. There's gold in them there hills.....
July 19th should be "Drive Like Rockford Day". R.I.P. Jimmie.