nice i myself have a 76 xt500C and my nephew has one too i also have a few TT500's as well love these thumpers that dude that says change to the Suzuki PE swing arm is 100% correct and the IT forks or the more popular yz490 front end swap complete with the double leading brake shoe's
Nice man ! Consider throwing on some 43mm YZ or IT forks, Suzuki PE alloy swingarm and some good rear shocks. There's also a DIY out there on how to cut the backbone and bring draw back the steering stem angle.
they dont call-em Thumpers for nothing !!!!!!!! .........thats a bad boy bike !!!!!!!!!!!!!! .............................just sayin ...............................:)