Best place to buy Minifins?

[NikB]

I'm looking to put some minifin drums on the back of my project Mini to space out the rear wheels the same as the fronts (Cooper S discs). I have seen some on Ebay for half the price of the normal suppliers, but they are unbranded. Does anyone know if these are any good, or dangerous copies?

While I'm here, what size arches will I need running 6x10 rims with this set up?

[NikB]

Thanks for the advice chaps, sounds like I either need to fit some Supafins or just a set of spacers.