Huh? E.P. I've got a 4-154, too (1983) and it doesn't have those seals. I recently pulled the injectors and had them serviced--just gooped them up good with anti-sieze (that P-Tex product) when I put them back in and they have worked great (knocking wood, knocking wood, kocking wood). Here are two guys in Florida
that are worth a call.
Diesel Injector Services/Riviera Beach, FL: (561) 844-8999. These are GREAT guys to work with-very straight up and knowledgable as well as affordable.
Complete Yacht Service/Ft Liquordale, FL: (954) 462-6977. These are Perkins dealers who helped me get some parts
. Have your serial
# ready and they should (hopefully) be able to help or offer an alternative.