I have a 1996 cat 426B backhoe ,the window frames that fit in the doors are so rusty that the windows are going to break if I don't do something very soon. I contacted every equip. salvage yard listed and no luck, tried Ebay for the last 6 months and came up with nothing. 1992-1996 cat backhoes 416-446 doors should fit , anybody have any info ? Thanks