4" & 4.5" bolt patterns ... new wheel choices ?

I have not seen any rims that fit both 4" and 4.5" bolt patterns, except some very old school "Uni-Lug" slots (I think they were ETs) that probably haven't been made for 40 years...
You'll either need to get dedicated front and rear wheels to fit your existing setup, or:
1.) use wheel adapters on the front (not my favorite option)
2.) convert the front to 4.5" bolt circle.
Do you have discs or drums on the front?