As a heads up, you can also find at least one other brand adapter that mounts FL / FD Canon lenses on LTM bodies. I bought one on eBay. Its code is LEICAN and I believe its a Novoflex brand (see below). It works fine enough except that when mounting an M mount adapter on it and attempting to mount the entire assembly on an M camera, the diameter of the LEICAN adapter is a little too big, causing it to bind against parts of the camera body and preventing it from mounting properly. (M3 and M4P both have this problem.) It works fine on the LTM body however, and I have used both a 35mm f2.5 and a 28mm f3.5 successfully - using zone focusing of course. On eBay I have found this LEICAN option is somewhat cheaper than the Canon adapter which is in big demand and tends to attract high prices on the 2nd hand market. I think I paid around 50-60 bucks whereas the Canon brand ones often bid up to well over $100 based on my experience of trying to buy a Canon version on at least 3 occasions.
Here is a link to the B and H site which sells them new.
http://www.bhphotovideo.com/c/product/241239-REG/Novoflex_LEICAN_Canon_FD_to_39mm.html
Incidentally there is also one designated LEINIK which does the same with Nikon mount lenses and I have another adapter (I think its of Russian origin) that allows me to mount an M42 lens on an LTM body.