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Use a drop-in anchor, you have to drill the same depth hole as the anchor (so it sets flush) and you need a setting tool. You pound the setting tool with a hammer to expand the anchor.....there you have a female insert for bolts that is flush with the floor. I have used 1/4", 3/8" and 1/2"
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1973 green 1.7
1973 Orange 2.0
1989 Ford F-150
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