Rear Wheel Spacers - What size and who makes them...

[Stockbroker1977]

Did a Wildwood front brake disc conversion to my 87 GN - had to use extended wheel bolts and the front wheels are now further out then stock. I want to bring the rear wheels out to match the front. They don't have to be exact but I would like the rear out on the sides further. Any idea what size (without incurring problems) I could use and who makes them? Are there any draw backs? Thanks for your help...

Jason