Mark,

The Saito fits the included mount fine. To get the recommended distance from the spinner backplate to the firewall, it will be almost at the very front of the mount as far as you can get it. You'll end up spreading the mount apart as much as you can get it, but the engine will fit between the beams. You will also need to use a counter-sunk machine screw for the mount at the firewall on the upper right side(viewed from the front) - the carb hits the included hex screw.

I'm not pushing you but I think you will be very happy/glad that you put the saito on there.

Know what's funny, is I haven't even maidened mine yet!!! Just going on what some experienced flyers have been telling me