The Moki radial mount will work on the firewall. I chose to use the supplied mount on mine, but I did hold the radial up to the firewall and it would have worked. The length with the radial mount is also appears to be correct for the cowl, about 6" from the drive washer to the firewall.

Good motor/plane combination. You can see lots of pictures of mine with the Moki 180 earlier in the thread.

I used a 20oz tank on the CG.

Richard