My dealer has gotten me two sets of these with different part numbers, and both have been too large. Does anyone have a part number that will definitely fit the holes on the factory plastic bedrail protectors on an '05 K3500 Dually? Thanks for any help.
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Please send me a private message to whomever knows about these. I can't find any either. I have the factory rail protectors also.

My truck is a 2001, I had the dealer get me p/n 12484940. They're too big but I trimmed them using a belt sander to the proper size, (you could probably cut them close and file the rest also). Then I siliconed them in place. This worked for me because my tonneau cover rail sits over them and holds them in place. Good luck.