Most parts stores have them just ask for a 6 bolt PTO gasket they come in many different thickness if you are running a PTO get a few of each. You will need them to set backlash. If You just have the cover use the thickest one and call it good. If you are running a PTO mix and match them till you come up with 6 to 12 thou backlash with the PTO bolted to torque specs.
