April 7, 200519 yr comment_119782 I've owned 1971, 1972, and 1973 240Z's and the only one that had actual steel "no sag" springs in the seats was the 73. All of the others had the strap support systems. I believe that they made the switch in '73 due to the requirement for seat belt warning sensors to be installed in the seats. Link to comment https://www.classiczcars.com/forums/topic/15555-original-seat-cover-option/?&page=2#findComment-119782 Share on other sites More sharing options...
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