The crossmember out of an 88 WILL NOT bolt up to a pre-88 chassis. The mounting points are very different. You can remove the complete crossmember with the suspension and steering rack attached from your car and bolt another one in. The rear pivot for the lower "A" arm and the upper shock absorber mount are the only suspension points that bolt directly to the chassis (as far as I remember).
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Rod Schneider, Woodstock, Ga.
"You can't have too many toys!"
1988 Fiero GT
1966 Porsche 911
Van's RV-6 airplane-under construction