Both Bit and MicroSizers gear sets come with chrome rims. I've never seen any of a different color.
Here's a few possible solutions:
1. You could always paint your rims. That way all four will match.
2. You could get some replacement front assemblies (knuckles & chrome rims) and switch them with the gold fronts. You car will now have chrome rims on all four corners.
3. You could remove the gold rims from your existing rear axle and remove the chrome rims from the new rear axle and do a swap.
(I don't recommend this though. Lots of possiblities for breakage!
)
I'd go with either #1 or #2 depending if you want colored or chrome rims.
Personally, I like to paint my rims.
