If the Strut Bar is a GM Performance Parts Strut Bar then you have to purchase a set of end brackets.

The same front strut bar can be mounted to the rear with a set of rear strut brackets.

http://drcustomparts.com/HomePage.htm

More info at w-body.com

First off, where did you get the 99 grand am strut bar?

If you need a rear strut bar then there is a guy in the NECO Forums that makes them so you should check that out. And if you are looking for a front strut bar then this is where I got mine from.http://www.promotiontuning.com/Merchant2/merchant.mvc?Screen=PROD&Product_Code=67303&Category_Code=9902CougarSuspensionStrutBar

A strut is a rod or bar designed to resist compression.

MINECRAFT