VEVOR PTO Shaft 1 3/8\" PTO Drive Shaft, 6 Spline End Round End PTO Driveline Shaft, Series 4 Tractor PTO Shaft, 39\"-55\" Brush Hog PTO Shaft, Black PTO Shaft for Bush Hog/Finish Mower/Rotary Cutter

Yes,The John Deere Type 550 tiller fits this PTO shaft.

I would say it should. As long as a series 4 shaft is what you need. You will probably have to cut it to length to fit your particular tractor. I have a tater/countyline tiller sold by tractor supply. The tractor end is 6 spline with a spring loaded catch as most are. Implement side is round (slides onto implement) with a 1/2" shear bolt. The shaft is triangular. Hopefully this helps. I bought it to replace the tractor end which was cut too short to fit my new tractor.

The size is 12.7*90mm.

The shaft can be cut.

According to the product description, it is designed for direct replacement and easy installation, minimizing the need for expertise.

Based on the product information, the PTO shaft is designed to be compatible with tractors having a 1 3/8 inch 6 spline output shaft. However, to determine compatibility with your specific tractor model, I would recommend consulting the product manual or reaching out to the manufacturer.