Cylinder head top gasket set for Kubota V1903 engine. 
 
On early engines the rocker cover gasket is a simple rubber band type seal that fits in a groove cast in the rocker cover. The rocker cover itself is secured with domed nuts running down the centre of the top of the rocker cover. 
On late engines the rocker cover gasket is a moulded rubber seal. This seal fits the cast shape of the rocker cover and the rocker cover is secured by a series of special bolts around the perimeter of the rocker cover. 
 
This is also known as the Millenium engine.
Jem Ref: TS93M