I just got my new (white) fortec 120cm dish, but there was no 40mm lnb holder. You just shove your square lnb into the end of the lnb arm. I want to put an invacom quad on the dish, but I require a 40mm lnb adaptor or a new arm with the 40mm holder. Does anyone know if such an adaptor exists for large dishes? I have also noticed that the lnb arm may be too long to slide the invacom into optimal position. Any suggestions?