1967,1968 Plymouth Mag style wheel covers
Plymouth versions of these are more difficult to find than the Dodge version but they are out there. There are two? individual ones on Ebay for sale as of today but the prices may make you cringe. They've been on there for awhile with no takers so maybe the sellers will deal if you ask. There was also a set of (4) Dodge ones being marketed as Plymouths that had relatively nice bases on them. The last time I tried to piece together a set of these a few years back I ended up buying six to get enough good (not perfect) pieces to make a set of four. Unless your win the lottery lucky you will likely have to do the same. Wishing you success in your quest !