Mounting hole pattern, 5" to 5 3/4" square.
Mounting slots in each corner.
Each corner slot is 5 1/2" from center to center.
7" X 7" square seat plate.
Slots attach with 1/4" bolts.
Slot is (a tight) 5/16" wide X 3/4" long.
Swivels only. (No rocking.)
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Square plate gas releaser has 7" X 7" footprint.
Install bolts mounting pattern from 5" to 5 3/4" into 8mm X 20mm slot size.