1974 Kz 400 Valve ajustmet plugs

Hello does anyone have a spare Valve ajustment plug for a 1974 KZ400 I think the later ones were different, or does anyone know of a replacement from anoter bike that would fit, I think a previous owner must have been a body builder one of the ajuster plugs was so tight it broke while I was trying to undo it, the sump drain plug was also so tight I had to use a an impact wrench to undo it , the Plug I need is number 17 in the diagram 
 

I do not have one to offer you. Partzilla indicates they have them in stock.
www.partzilla.com/product/kawasaki/92066...389daf0f0ceb19c13804

Thank you thats great I will ask if they ship to the UK I have been looking on EBAY without any luck 

OK, did not know you were in the UK. You might want to look here instead.
cmsnl.com/kawasaki-kz400-1974-usa-canada...15452/plug_92066066/

Thank You I should have said I was in the UK, I am now wondering if the Cam/Head cover that holds the rocker arms could be changed for a later model one say from a 1978 with a more direct way of adjusting the valve clearance 

Newsman wrote:

Thank You I should have said I was in the UK, I am now wondering if the Cam/Head cover that holds the rocker arms could be changed for a later model one say from a 1978 with a more direct way of adjusting the valve clearance 

 

The heads from the '78 and '79 are different. The part number for their plug is 92066-1066.