This is a motor mount drilled and tapped to fit O.S. 61SF, 61SF-P, 61RF, 61RF-P, 60FP, 61FX (2-stroke) Includes all hardware necessary for mounting the engine to a firewall and to mount an engine to the engine mount. The nose gear hole is not pre-drilled. INCLUDES: Four engine mounting screws (to secure the engine to the mount)- M3.5x16 Four lock washers (for the engine mounting screws) Four blind nuts (they fit into the firewall) Four motor mount screws (to secure the mount to the firewall)- M4x20 One L-wrench for the screws SPECS: Type of Material: All Aluminum mount with Steel screws and washers Type of Mount: Beam Style, Square Shaped Back Length: 78mm (3") Width: 45mm (1.77") Height: 45mm (1.77") Center Distance Between Firewall Mounting Holes: 46.6mm ** Distance from firewall to first engine mounting hole: 37mm COMMENTS: The firewall mounting holes are in a square configuration, so C.D. dimension would apply to top and bottom and side to side. cmc 9/01 JBN 7.6.93 ir/jl ** updated ** cmc 05/12/05