I checked Amazon and actually bought the same Bully lock you did. The problem was that almost all the specs on the LH-007WD listings were incorrect, kind of. They all said '02-'09 which is half true because in the middle of production of the '09s, they switched the tailgate to the 4th gen version. So the first '09s used the LH-007WD, but the bulk needs the newer version. They refunded me pretty quick and hassle free.
I just can't believe that nobody has put together the parts needed in one package. I'm gonna start calling wrecking yards, their websites are worthless.
I had to check my Amazon order history to get the specifics. It seems that that product is now listed for a model year range of '02 - '08 even tho they might fit some of the early '09s. That's a tough break in your case.
I have very little recent experience getting parts from wrecking yards. Many, many years ago (way before internet and websites) we just called and asked the guy that ran the wrecking yard if they had a particular vehicle and if the part we needed was still on it. Those guys generally knew what they had and could usually give a yes or no over the phone. I know that many of those businesses are now very sophisticated i.e. have websites with search engines but it's still probably your best bet to call or if there's one close, just go there.
I have a friend that, for a number of reasons, has need of the services of wrecking yards. We have 2 or 3 within ~20 miles. He has established good rapport with them. Many times he's told me that they let him harvest the parts himself! Most of the sophisticated places probably don't allow that.:smiledown:
In your case, I imagine that you will have to find a truck with a damaged tailgate in order to harvest the part you need. With tailgate theft being kind of an issue, undamaged/complete ones are probably in high demand. Good luck with your quest.
RipVan