The Deere 317 was built from 1979 to 1983. Early ones with the Kohler series I engine had lubrication problems that resulted in engine failure very quickly if operated on slopes. A KT17 (good engine) Series II engine can be identified by an engine specification (Spec.) number of 24300 or higher. They closely match the 300, 312 and Kohler powered 316 (1978 only). In fact the 317 replaced the Kohler 316, and was in turn replaced in 1983 by the legendary 318. The 317 shares the frame design with th earlier 300 series tractors, but the later 318 and Onan 316 had a totally different frame design, totally different in the rear attachment set ups, but still similar in the front. Basically if you can find used attachments for the old Deere 120, 140, 300, 312, 314 and Kohler 316, they will fit your tractor with maybe a tweak here and there. The mower deck should be 4 feet wide. I am unaware of a 3 foot mower deck for these, unless someone has cobbled something together on it. These could be set up with sleeve hitches or a cat. "0" three point hitch to operate lots of different attachments.