I think that most GM rims of the era look quite good on Riviera, including the ones above. They look appropriate, unlike many "sporty" and "modern" designs.
I, personally, use Cadillac STS' 7-spoke rims for the summer and some noname 5-spoke rims for the winter, the latter I want to replace with something made by/for GM.
P.S. I'd replace any of my sets with those Park Avenue chrome ones in a heart bit.