George,
The pin I have has the sleeve that adapts the 1/2 to 5/8. It is similar (identical, probably) in appearance to the one in the pic above.
I drilled my own 5/8 hole in the multi-mount and can't imagine that the pre-drilled hole on the Hummer-specific mount would be anything different. If it were 1/2 there'd be too much slop in the fit?
Rod
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\'05 SUT
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