Just my 2 Pennies worth, But I just have a HARD time "Trusting" spacer's from coming....LOOSE???
I took my time, and found the wheel's I've alway's wanted for my '87.
9.5x16 & 10x16 wheel's made by BBS in Germany, Found 'Em at the GoodGuy's
Show/Swap for $400 for the complete set! Spent another $300 having some
minor Road Rash removed, and then Mirror Polished. Now they LOOK like the
Mega $$$ Wheel's they are.
I have half inch spacers on the rear wheels of my 86 Vette fitted with '88' wheels. I picked up the information about required spacing on this site a long time ago and the spacers that I installed have worked very well for me. The 88 wheels have a different offset than the 86's and before the spacers I found that on deep road dips the inside of the wheel would come up and bottom on the inside fender well. The spacer adjusted the offset so that the wheel bottoming didn't occur. I have not put the spacers on the front because the front wheels didn't seem to have that problem. That's my experience for what it is worth. I hope that this helps you in making any decision.