We bought a 20ft 1991 1020 this winter. I remember the old guy I bought it from telling me how to get it ready for wheat pointing out the little brackets that go underneath the head, I think there's 5 or 6, and i have those, and also showing me the chain by the wobble box on the Lh side and telling me I need to take that off and stick a piece of metal in it's place. I asked the local case ih dealer about it, and they didn't know what I was talking about. Said all I needed was the stuff underneath. Then I got a manual in the mail, and sure enough, shows the piece the old guy was talking about. I can not find this piece or a part number anywhere. I've spent enough time staring at the case ih parts website to drive me nuts. Anyone happen to know the part number or if I can get by without it?