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What is the OE PN for a filler neck, 2001 F350 extended cab 96" bed 7.3L? (the number I have is 8C3Z9034KF but this doesn't seem to be correct)

Background:
When filling with fuel to the very top of the tank, there was some leakage from near the top of the filler neck but not from the filler opening-- presumably a rust hole has developed up near the top behind the sheet metal. The hole typically isn't a problem when filling, but does mean dirt/water can get in which is a problem.

So after searching for a while I bought a Spectra Premium FN728 (at a very premium price..)-- and being wary of aftermarket "right part but doesn't fit without using a hammer", before taking anything apart I found the OE filler cap does not fit. I sent a query to Spectra Premium which came back with the helpful advice that I should buy a Stant filler cap! I am reluctant to pull the old filler neck only to find the FN728 doesn't fit, with more helpful advice to use a hacksaw to correct the discrepancy.

I want a part that actually fits like OE. Barring that, I might as well repair what I have, it is just a couple of pipes that seem pretty solid-- but with rust, one tiny hole is just the camel's nose.

Thanks.
 
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