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Patrick,
That should work fine. I did upgrade my bolts to Grade 8 to be sure that they could handle the task. Had to have a tow strap/hook permanently mounted for racing, otherwise I would have just looped something through as well.
Yours is a simple solution that you can carry in the boot for emergency purposes. I wolud suggest upgrading the bolts and just painting the heads to match the quick jack.
Jim
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