Off the shelf fuel level sender part number ?

[full foot notch]

If the quest to see if my fuel sending unit level is bad I need to get a replacement one to be able to swap out in case my current one is, which all signs point to ( needle sits at 3, ground signal wire and it goes to empty , and try grounding the sender itself and sits at 3), I've looked at advanced auto parts, autozone, and even rock auto and they do not have it in their catalog at all. I've seen them on various truck part websites but all the part numbers are for their internal catalog and I'd rather not have to go thru the trouble of having to order online, wait a few days, and if needed have to return it and pay a restocking fee. I'm trying to see if anyone might have an off the shelf part number for the basic 2 tube drop in sending units that are factory these trucks, I've tried the search on here with no luck at all.