i ran across this engine from Brodak.
http://brodak.com/engines/engines/broda ... ngine.html
it is a beam mount which is different than Cox 'firewall' mount.
plus it takes a seperate gas tank while the Cox has one built in.
they call it a 'MK II .049' engine.
it comes in C/L and R/C version.
hey, at least it's an .049!
Have A Nice Day!