Could they be a different brand? Prestolite wasn't just a mopar only part was it?
That seems like a possibility, I noticed my Challenger's horns are stamped in the week - year format, 47 9.
just recently, a good buddy and i were at a recycle yard looking for horns for his 54 chevy.
that exact mounting bracket and horn assembly was what he picked up from a [somewhat] newer 2000ish gm vehicle like a midsize, or what small car passes for that these days.
they are located behind lots of plastic panels around the grille area on the driver's side of the car.
