this one is a 97.
THE "UPGRADE" was done in the 90's, and was changed to 2 springs, and a different nut.. and that nut
must be used in the upgrade // replacement...
https://www.murphskits.com/product_info.php?cPath=1_107&products_id=148&osCsid=0w3RwS14lzD3jIiPLoa83