The fenders were an option. $14.00 per pair in 1954 price list. I do not know if a 12 volt system was ever used in the later models. I do not remember seeing any of the later tractors with the THD engine. Shaw did not update his literature much in the later years. I remember writing for information in the early 1960's and some of the information I received was printed in the late 1940's. My dad told me that something must be wrong with the company to be sending out such outdated information. A year later, the company became a division of Bush Hog.