I've always hated the factory spare hold-down bolt, because it sticks up from the tray, and is only held by a thin speed-nut, which usually bends or rusts, allowing the bolt to fall out. So I bought some threaded rod, and welded it to a hook; and I welded a short square tube across the tray. This should be MUCH easier to slide the spare over, and then clamp down.
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