[Road Warrior H2]

I have the same early model tire carrier made by SMA on my SUT and I use a Master Brand 1/2" Hitch Pin that is the locking type so no one can take the pin or swing the carrier out without unlocking it first.
And it was cheap. It came with a 5/8" sleeve to use on both size hitch pin holes an the tire carrier is 1/2" so it worked perfectly for me.