I found 16 wheels caught the wheel arches when opening the bonnet, I could only open the bonnet with the wheels on full lock. The original Ferrari California was fitted with 15x 6J wheels and they look to me to be just right. If you look at the pictures of the wheels fitted to the blue Tribute you will see that they fit nicely inside the wheel arches.
I did try some 15x7J wheels but found they caught the outer wheel arches. I would have needed to fit Z4 hubs to try and narrow the track, lots of work and cost which can be avoided. I thought the 7J wheels just looked too big, like something out of whacky races.
Fat tyres look great on a 70's muscle car but not so good on 60's Italian exotica. I can also supply a billet aluminium spinner removal tool, this saves you from damaging the spinners with a bloody great hammer, The spinners are solid stainless steel so are very strong and will not corrode but if you use the bloody great hammer you will damage them. I can also supply a tool to allow you to lock the hubs to allow emergency removal by the roadside. The wheels used a peg system rather than the older splined system, this is much stronger for today's more powerful engines. The wheels on the blue car were fitted over 2 years ago and do not have a speck of rust on them, the car lives outside in all weathers.
It really is that simple. I had in the past used old sets of MWS bolt-on wire wheels. The problem with these is that they weigh almost twice as much.I did have a set blasted and then chrome powder coated, this made them look much more presentable and although the chrome powder coat is very good it definitely isn't chrome. The item "15 chrome wire wheels, bolt on hubs spinners for Z3 250 SWB or California kit" is in sale since Friday, June 18, 2021. This item is in the category "Vehicle Parts & Accessories\Car Wheels, Tyres & Trims\Rims".
The seller is "jaguartvr" and is located in egham, Surrey. This item can't be shipped, the buyer must pick up the item.