These 6mm engine studs are for almost all cylinders and kits, and can be used for exhaust and intake studs.
Minarelli Cylinder Stud!
Sold Individually.
Universal intake and exhaust stud.
Usually found on Franco Morini exhausts, but maybe other uses as well.
4 x 6mm Studs. 100mm long. Works on the Honda PA50, Express, Hobbit, ect.