cobra rear ---- need rim and tire advice please help
 

I have a 93 4 lug cobra disc rear i plan to swap into my 90 lx. The cobra rear is 1.5 inches longer than the drum rear. This poses a problem as far as rim and tire combinations. Right now i have 15x8 draglites, 5.5 backspacing with 275/60/15 on it. I know this wont work with the new rear because i would need 3/4 inch more backspacing to use that big of a tire but i havnt found any 15x8 rim with more than 5.5 backspacing.

What can i do? Im willing to buy new rims. How big of a tire can i put on it? I have to figure something out before i do the swap.

thanks for the help,