81 rx7 drag racing rims 15x8

I have a 1981 rx7 that is going thru major changes. Im putting a small block 350 chevy and th350 tranny with about 400 hp in my rx7 but the problem is that i cant find any 15 inch rims for it! I've looked every where on the internet and no luck so if someone knows where to get 15x8 inch 4 lug rims ( I dont care what they look like at all) just want to race and the 14x5 spin way to much thanks for all the help. Also if it really matters im putting P275/50 r15 slicks on it which mean 26x8x15

Panasports, they will custom make whatever width, bolt patter, and offset for you, and there reasonably priced.