P1 Mfg K086-H01S. Fits Kubota V2203 & V2403 4cyl Diesels, and possibly more.
Includes 18 studs/washers/nuts, 1 pack of lube, and 1 brush. Fasteners are made 
 
This head stud kit was specially designed through a colloboration between me and P1 Mfg.
I wanted a head stud kit to help hold the engine together once I started applying boost, even if only a little bit. The 2x03 uses a whopping 18 head bolts!  By upgrading to this head stud kit, you can live with the peace of mind that your head gakset should live a long, healthy life.