My 7-73 MPC shows 70-74 Firebird hinges as 3990431 and 432. Also in post #3 and #4 spring P/N 546325 is mentioned. My MPC shows this spring used on 69 Firebird with 400 4 B.C. only. This # was NLA 4-75. Anyone know why this spring would be different?
Last edited by TXSTARFIRE; 03-15-2026 at 04:15 PM.
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