Used part number 23-20658, Clamp Bracket Spacer used on the Mark 20H and the Quicksilver H and Q towers of the KG4 and KG7. Also used on the KG7, KH7, Mark 10, 15, 15A, 20, 25, 28, 30 and the Merc 100, 200 and 250. Shipping via Small Flat Rate box for $10 to USA addresses.