Hello, i have an Alpha Trainer 40 which my wife got me 2 years ago, well the evolution engine blew up in short order ($80 engine that came with the plane so oh well) now i have a brand new OS.46AX-i for it that i got for xmas, the problem is the original motor mount is set up for 4mm mounting bolts and the OS is set for 3mm, and i looks like the mount is too wide as well, any suggestions on what mount to get? and will i have to redrill the firewall to do it?