Go to the TREK TRACKS forum;
TREK Tracks
You will have to register, but it is very easy and you will find ANY and ALL information you could possibly want for your TREK, including the EMB (ElectoMajicBed) and all the parts for it. There is an entire forum on just the EMB, and one of the moderators (LOWELL) is an expert on the EMB.
Good luck - Glenn