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Completely different style/principle but if any interest, Canada's Drag Dimensions offered Coil Spring Traction aids called 'Diggers' for 64+ A-Body cars as bottom of this '71 DD Catalogue pic below.
Diggers were designed by one of Drag Dimensions' owners Carl Rowland who was better known for his NHRA C/Altered Record setting Fiat, usually sporting Karbelt livery.
RIP Curly.
~ Pete
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