What car are you trying to build / 1:1 wheel size do you need? I might be able to help with a set of 1:24 Aoshima / Airfix / Revell MGB wire wheels & tyres (14" at 1:1)* or those from a Tamiya Jag Mk2 (15" at 1:1) - only 4 though.
4, but possibly also a 5th - will need to check!
If you can only get 4, there's always the option of having the exposed spare wheel under a cover
