Inner fender rubber skirt

I think I know what you're talking about but I can't find it on courtesy either. It isn't where I though it would be, under front fender and fitting. However, I think if you did find it you would probably be turned off by the price for just a piece of rubber. If I were you, I'd figure out some way to just rig up the one you to make it stay on there. Or just take it off, water gets to your engine bay when it rains no matter what. I doubt you'll see any premature failure on anything just because that isn't there. There is without a doubt more than a handful of first gen Frontiers running around out there without the part in question.

Found it, Hood ledge & fitting is the diagram you want.
640 Hood Ledge & Fitting :: Body Front, Roof & Floor :: Genuine Nissan Parts :: Frontier Parts (D22U) 1998-2004 :: Nissan Parts, NISMO and Nissan Accessories - Courtesyparts.com

Cusser said:

Especially on 1st gen Frontiers with 4-cylinder engines, "mechanics" have torn this to access R&R of the oil filter. On my '98 it is torn into two pieces, and I've attached with some sheet metal screws. I can't remember on my 2004, but it's got half the mileage of the 1998..

As to a factory part, call the dealer or one of the online parts dealers. Nissan often calls certain parts by some "interesting" names, meaning that you'd need to know their name for the item to search it.

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Part number is the only way, trying to figure out the Nissan name of a random part like this would just be a waste of time. If you ever try to get a part from a local dealer get the part number from courtesy first. However, it isn't even the whole number. This part for instance, 64836 is all courtesy has. 64836-66Y00 is the full number. A quick google search of the first 5 numbers will get you the second half.

Also be warned, courtesy and the other online genuine Nissan parts retailers are as cheap as it will get. Just the other day I called my local dealer about getting a new positive battery terminal (or as Nissan calls it "CONNECTOR ASSY") They told me it would be almost 32 US American dollars for something Courtesy has listed for the MSRP of $7.11. Even though you pay shipping, it's still cheaper. Keeping that same percent mark up, that POS would be like 70-75 dollars.