I put a CRF 50 seat and rear fender on the 16 36v. 2 screws to the frame on the front and zip ties on the rear. the fender is a little short and mud flicked up all over his back so today I zip tied a CRF 50 front guard underneath the rear guard to extend it. My son rides on the MX track sometimes so the seat puts him up higher putting him in a better position for cornering with one leg out.