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the hardware store next to my house has a bunch of them like 1/2", 5/8", 3/4", 7/8", and 1". Id pick up the 3/4" ones and drill the hole out a little bigger so it fits even if covered in mud.
Those are the 2 typical shackles people use. 3/4" is the most common. Some People use 5/8" shackles but I personally wouldn't use less then 3/4" for a fullsize. I have both 3/4" and 7/8" in my truck.