Can you use a ring gear spacer and put 3.08 - 3.73 gears on a 2.73 carrier in a car rear?

http://cgi.ebay.com/ebaymotors/Mr-Gasket-902A-Ring-Gear-Spacer-Series-3-GM-Kit_W0QQitemZ320282244462QQcmdZViewItem?_trksid=p4 506.m20.l1116

I'm pretty sure you can buy thicker gears that would work without having to use a spacer. I'd check into that first. I've heard of several horror stories using those spacers.