It comes with a reversible socket block and will work on a Mitchell base. I seem to have misplaced the U-bolts for it over the years, but Ashley at GPI tells me they can be found at www.mcmaster.com. Using the U-bolts (not included) will allow the Garfield Mount to also be used on speedrail in addition to a Mitchell base.
I’m asking $500 for the Garfield Mount with socket block. Please contact me through the forum or via my email – I will see an email faster. Thank you for your interest.