Widening sbp 5X4 14 inch wheels to 15's

There is a shop in Livonia that does wheel work. I know they will widen stock wheels and may also be able to do what you are asking. If you search for them you should be able to find them. I do know they are in Livonia, or at least they were a couple of years ago.

The good part is they are somewhat local to you which certainly help with saving shipping costs.