Wouldn't you need both since the rear calipers are offset (one leads, one trails)?
I'm really not sure, unless you can get the store to order both in, take both in and match them to yours.
I will just warn you that that I never succeeded in getting the parking brake to work the those iron calipers. I swapped to 1989 and later PBR bakes.
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2001 Trans Am WS6 •SLP Loudmouth II •UMI Suspension •12.857 @ 109.57
1996 Trans Am WS6 •Pacesetter Longtubes •Strange 12 Bolt •Spohn Suspension •11.152 @ 123.85
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