You need to establish what type of raw water pump
(see attachment) you have on your particular Perkins
, there have been so many changes over the years and Perkins have even stopped supplying parts
for the older units.
make an equivalent for my model year Perkins 6.354.
the 12001 type fits mine....best of luck the Perkins distributors are not exactly helpful in my neck of the woods, so I feel your frustration.