I thought the plain was Plymouth only....
and i thought the plain was truck.
The plain were used on trucks, vans and '71-up Plymouths.
Also used on Dodge/Plymouth cop cars after 18 holes were stamped into them.
thanks for the clarification !
now, if i can only remember this when needed ! what years were the stainless plain caps used, and when did they switch to aluminum ? i drilled "cop" holes into a trashed set of plymouth lettered caps one time after i ironed out the dents as best as i could. they were a unique cap to say the least. my brother is using them on his A-100 driver.