This mount is made by Xtreme Maxx (the words were added for another thread, its the only pic I had uploaded). I dont know for sure if you could mount this on a FLM chassis, but if its a flat surface behind the tranny you would just have to drill 2 holes so you could bolt down the motor plate end of the mount. The other end uses the chassis to rear bulkhead screws, so its almost a universal fit. I could probably fit it on a stock chassis with a little dremeling.
EDIT: heres the link:
https://www.ssl-stormerhobbies.com/c...=ns&pn=XTR1004