depami

Green

928GTSM

Just my 2c worth I'd keep them silver, black wheels suit some cars but personally I think they're few and far between. If you want it to look like a 90's Toyota Supra or some other Jap tuner car go with black. If you want a modern colour, i.e. the green you've used which I think looks great, but want to retain a class look on the car then I'd say stick with the silver and the nice coloured centres you've got.
I suppose the bottom line is it's down to either you or your son and personal preference, could you try photoshopping a picture you've taken recently with the wheels back on to see what it may look like with them black? It may give you you a better idea of which you'd prefer but I'd go with the silver.

Landseer

Silver. No black stripe kit, either.

jacal128

Silver, looks great

rligeti

Keep 'em silver. It looks gorgeous! Marvelous job. :-)

Marine Blue

Definitely Silver or maybe a slightly darker shade of silver but not black.

Mike B

Silver...car looks great Dean!

pcar928fan

Guess I am the dissenter here... I would go with a beautiful shiny black finish... If you stick with silver then paint the center caps the same green as the car and paint the crests... I did that on my light blue car. Looks cool...

rligeti

here's a quick and sloppy 'shop. I say keep 'em silver...

Jerry Feather

Silver, Silver, Silver, and Silver, one for each corner. NOT Black!!!!

nc_growler

^^^^^^ What Jerry said!

Dave928S

Silver will set that color off beautifully. It's looking good

AO

I like the black.... But thats me.

dr bob

If you really decide that they need to be refinished, I'd stay with silver but with just a hint of gold tone. It will warm up the look a bit and go very nicely with the green. IMHO anyway.

Erik N

Bronze.
Black or silver wheels only go so far on a green car. I painted mine bronze before the larger brake upgrade, and they were purrrrfect. I still miss them.
Bronze the hand-down best color for phonedial wheels IMHO.