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  • Kate July 8, 2024 at 6:22am
    For the 1963 Series 3, the bolts that hold the bumper brackets to the car frame are typically 5/16"-24 UNF or Unified Fine Thread and about 1" long. The tricky part is that they're fanged elevator bolts from https://jingweico.com/product/elevator-bolts/ , which aren't as common as regular ones. These bolts have a small, square shank under the head to help anchor them in place. It's no wonder the hardware store couldn't identify them.
    Elevator Bolts: Fanged Bolts, Euro Bolts and Ordinary Bolts
    We manufacture all types of elevator bolts with an annual capacity of over 2000 tons, whether you need fanged bolts, euro bolts, or just ordinary bol…
  • Sophie Caw July 8, 2024 at 6:20am
    They are 20 threads/inch. Can't remember for sure, but I'm thinking 7/16" diameter. If not 7/16", then 1/2", still 20 tpi.

    There are no Metric fasteners on an Alpine. The vast majority are SAE "fine".
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