Look at www.espritmodel.com under accessories and motor mounts. After that you have to make sure the shaft comes out of the cowl at the right angle and centered. Probably 2 degrees down and 2 degrees right trhust. I fly my funtana with a 4120 and the radial mount mounted on a 1/4 inch plywood piece which is adjusted out in front of the firewall with four 6/32 screws about 3 inches long and lots of nuts. It is very solid.