You don't need the special tool to compress the leaf spring. C-Clamps will work just fine. Although, as I recall, you don't need to compress the spring to change the rear struts. Search the forums at this site:
www.w-body.com for instructions/tips on changing rear struts.
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www.wicgp.com <- Wisconsin Grand Prix Club
1999 Black Grand Prix GT Coupe
1990 Red ASC/Mclaren Grand Prix Turbo Coupe
1990 Metallic Blue & Silver Grand Prix LE Coupe
1979 Blue Dodge Ramcharger