855d tires and rims

When i sold my can am i didnt sold its tires. So now i have extra set of big horn copies. Pair of 27x10 r12 and pair of 27x12 r12. Tires are Wanda P350

I was wondering that if i can use those with orginal rims but now it seems that they dont fit and i need to buy 14 inch rims. Has anyone tried that size with orginal rims?

Thanks, Jussi