Motor mount problems
 

Greetings
Here is one for you all!!! I am trying to shoehorn a Zenoah g-20 into a Great planes Super skybolt. The problem is the back plate motor mount holes come out where part of the cabane assy. attaches to the firewall. If I can spread these holes apart about 3/8" on both sides just on the top I will be cruisin. Any Ideas on who might make a modified backplate for this little engine?