Originally Posted by silverfox
keep in mind even with a 3.75 your only gaining 3/4 of a inch over your 4.5's
Actually if the 3.75" backspacing is on an 8" wheel versus his 7.5" wheel, the outside of the wheel will stick out an additional 1.25". Still not a huge amount.
Don't buy wheel spacers. You will spend more on good (which is a relative term) wheel spacers than you will by selling your wheels and buying new ones with the correct backspacing.