Having just mounted my 3rd engine in my LT-40, the original engine mounts are beginning to look a bit like Swiss cheese.

I had intended to use a new mount for the 3rd engine (an OS FS70), but I didn't have one that fits. The SIG large engine mount SIGEM001 is very similar (in that it is two seperate arms of similar size) but doesn't quite line up with the firewall holes on the ARF. When you do get it on (by enlarging the holes) there is no adjustment as the mounting holes aren't elongated like the ARF mount.

I emailed SIG last night about the ARF engine mount and received a reply this morning (wow, that was quick), so I thought I'd pass this info along...

"The ARF mounts are available by calling 1-800-247-5008 between 8am and 5pm CST. The item number is SIGRPMM267ARFRA".

At $10 a pop they seem a little steep to me, but at least you can swap engines around without redrilling the firewall for different engine mounts...