My belt's part number is 2RB103 Mfgr is "Jason" the PN is for a two rib "B" profile and 103 inches circumference, I don't know what profile the SOM grooves are so you would have to verify that, I'm not sure if a bonded 2 rib belt is even needed in your case you may do just as well with 2 individual v belts but that is something you will have to determine for yourself, I picked my belt up locally for $45 or so