Garelick/Eez-In 99182:01 Under Platform Mounting Bracket for Sport/Diver Ladder Allows Ladder To Be Mounted On Any Poly, Teak, Fiberglass Or Aluminum Platform Mounts Underneath Platform And Includes A Top Plate Which Sandwiches Platform In Between Brackets Used With Face Plate And 10 Deg Poly Spacer (99180) Included With Ladder W: 3.18" (8cm) H: 9.75" (25cm)