Suitable for most European plastic tanks, generally made by Acerbis. Flange-mount, center-to-center dimension of holes is 34mm/1 3/8". Definitely fits Husky ('84-on, petcock on right), and other Euro makes with petcock in similar location. Includes tank-sealing o-ring. These are NEW parts, of modern materials for modern fuel. Made in ITALY.
The petcock has circuits for main and reserve, but this can be eliminated if one wishes.