I measured 34" center to center on the brackets. Don't think it's critical, check the center to center of the spring frame that hooks into it. 16.75" from leading edge of bracket to the trunk divider. That's shooting a tape measure under the installed seat, may not be exact. I would set the seat bottom in and see where the spring frame hangs down. Then go back around 3/4" so the frame is under tension when latched in.
Best I can do, sorry but I wasn't pulling the seats out for more accurate measurements.
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Hank
70 Chevelle SS396(454), M20, 3.73
My Chevelle
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