I am fixing to purchase a 1994 cummins 4x4 5-speed. On the top of the P7100/P-Pump there is the injector lines and delivery valves. What is the metal piece that attaches to the injection pump where the delivery valve goes into the pump? It is cracked and I want to know if it can just purchase 6 of these top pieces and just replace them? It is the front injection line that I noticed leaking through the crack.