YOur best best is to go ask Tony or Bill in the suspension forum at sportruck.com. Tony works for air ride technologies (www.ridetech.com) which markets firestone bags. Bil works for the Air lift Company (www.airliftcompany.com). Either guy will give you the straight scoop on what you need for your application. These guys know air ride.... my .02
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Mike
76 Chevrolet Stepside- 402 BBC, pro street
95 S10 2.2 Bagged
www.geocities.com/wikedsensation