These are a direct bolt on for any 88-96 w-body and are a very good upgrade for the cost.
This is from
www.gmpartsdirect.comGM PART # 12498649
CATEGORY: All
PACK QTY: 1 CORE CHARGE: $0.00
GM LIST: $46.24
OUR PRICE: $32.37
DESCRIPTION: PERFORMANCE REAR TRAILING ARM KIT
For use on 2000-2005 Chevrolet Monte Carlo; 2000-2005 Chevrolet Impala; 1997-2003 Pontiac Grand Prix. This kit increases rear suspension performance by eliminating rear suspension flex. It includes two rear trailing arms.