Wheel spacers?

I am planning on leaving my car SBP and want Ralley wheels for it. This limits my choices. Today a friend told me they make SBP to LBP adaptors which add about 3/4" to the outboard offset. Has anyone here used these and if so does one need to buy deeper offset wheels to compensate for the added width. BTW, I am still in the market for a set of ralley wheels as the last deal fell through.
TIA, DM
Hello Rat! I have 2 really nice sbp rallye wheels that you are looking for with center caps. I can ship them your way. Then you will only need two more and rings. These are sbp, 5.5 wide X 14". 3 3/4 backspace. Bullit center caps. New Rallye wheels can be bought thru Summit Racing or Jegs with center caps. Email me if interested.