This thread inspired me to hunt one of these down...
The parts guy at my dealer found several "matchy" part numbers, but the system showed my truck as not compatible.
And yes, these things are PRICEY for what they do... pushing the $300 mark just for parts.
You have to order the "handle", a bracket with two studs and nuts that go into the stake pocket hole for the "two bolt" side of the mounting bracket, and the 3rd bolt-and-nut for the 3rd mounting hole/bolt.
I found an ebay seller that sells these quite often it appears... search for "silverado tailgate assist handle", and look for a seller "modernmuscle" or Modern Muscle Salvage.
I bought mine from them at $124.95, tax and shipping. The price included the "two-bolt" bracket and nuts. You are on your own for the 3rd bolt.
I am pretty sure as long as you have the 3 holes, you are good to go.
I opted to just use three 5/16" toggle bolts with washers and lock-washers.
This was also compatible with my ERG Rolltrac bedcover.
