John, I can relate to the memory problem. I am in the 50+ age range. This summer I was in an accident loading a garden tractor and sustained a serious head injury and had cob webs for several weeks. I now have an excuse for being absent minded. I too have seen early models of the 550 with the fiberglass grill.
On another subject, who manufactured hay conditioners for Oliver in the early 60&#039;s? If memory serves me correctly we had several problems with them.