From what I have seen on the ones I have bought from wrecking yards and labeled them, the 215 fans are on 340 and 69 down high rpm cars. The a12 cars started the 216 with the big rad. Most 340 a body cars got the 215. Both fans could come one any application so you can find them on anything. I’m sure the stamped ones Alan has are NOS bought well into the 70’s or 80’s and would be the ones last made and sold through dealers. Most of the earlier cars I have seen had the ink stamped. They changed at some time to the stamped ones.