Okay, I am working on the GF due to a small coolant leak at the upper LH of the timing chain cover. Everything must come off, so I replace the water pump, gaskets, and go to get a fuel pump. The new fuel pump doesn't work, the oil return hard line (which is basically a banjo bolt with an adapter, a 4" piece of pipe w/threaded ends, and a female adapter on the outside end) will not thread in. I look closer- the upper section of the pump body is more 'flared' out in it's center, which kicks the oil line off center. The Carter number is M60519, and the other P/N is M60514. Tried the other number, same issue. Tried several other suppliers (and referenced off the 2 P/Ns'), nothing different- heck, even the dealer has an NS1. Airtex did offer to rebuild it for me, for the bargain price of $150+ S&H. Best deal? Arthur Gould (in NY) who will rebuild and ship for about $100 I'll do it later, mine still works, but be aware not to toss these pumps!