Self etching primer is usually for bare metal, being these are rubber faced I suggest/used SEM flexible primer, should be able to find a place to ship to you.. where are you again?
Unless the wheels need multiple heavy coats, 1 can of SEM primer worked for all 4 wheels with 1 medium coat, 2 cans of the OER for 4 wheels with 2 medium coats. You dont want too thick of primer/paint on these, it can contribute to cracking or build too high and make the sharp edges look dull. But the OER paint is easy to apply and lays out smooth, you should be fine.
Lugs are same as ralley 2s, tapered seat acorn style, theres some nice chrome plated ones on ebay for low cost, again probably same manufacturer other places sell for higher. I used these on my rally2s, nice chrome & look like new after almost 10 years.
https://www.ebay.com/itm/26164583689...3ABFBMrvHTw79l
Paint for rear of wheels can be any good quality spray can, rustoleum, krylon or more expensive eastwood types.. I used rustoleum after cleaning & scuffing the backs & insides, they were in good shape on mine just a little dirty, used it on the back of the rallys too.
Found a couple more pics of the honeys with the repro cap & a crappy trim rig layed in place to give a better idea of the OER color.