SuperFarmer, If the TR75 is not a very early one(top drive feeder house) and has a bottom drive feeder then you would need a 972 flex head. They had 13,15,16 and 20 foot sizes. You can adapt to a top drive if you need to. Early grain heads was a 960, but a 972 is better. Cost should not be much here in Il, maybe $1000-1500 for a good 15' 972. Ilnewholland