Replacement 45mm piston kit for multiple kits. These are what come with the DMP kit but will work in the K-Star kit and possibly many others.
This is the style with the ring end right at the top middle.
Yamaha DT50LC Air Filter
Yamaha DT50LC Replacement Headlight
Suzuki FM50 Parmakit Gasket Set
Suzuki FM50 Parmakit Replacement 45mm Ring
Bosch W8DC Spark Plug