Perkins, Caterpillar, Shibaura, Volvo Penta, Case, New holland engine head

I have two identical newly rebuild heads for Perkins N843 block, which is also used by Volvo Penta MD2040, common in sail boats. It's also used in skid steers, mini excavors, tractors, etc. By Shibaura, Case, New Holland, etc. I'm sure I'm leaving a lot out. This is the head to the Perkins 3 cylinder N843, 1.496 liter engine. These heads have been professionally reworked and have new or reground valves, new seals and guides.