my guess is someone changed the spring on your 1970 set with the larger springs. There is a reason Pontiac went to the larger springs, personally I haven't noticed much a problem with the smaller springs on my 70 vs my 71. but they did change to the larger ones in 1971.SO my guess is, some previous owner, or their Pontiac Dealer, switched to the larger springs ,but kept the "70 only" hinge assembly, at some point in your cars life.. Just a guess, but agree with ric... they only had one style for the 1970 cars.. the small spring set up..
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