Contact Grumpy, he knows of a place close to him that has a yard with trucks. I found a set through a member and was gifted a set.
If your doing a frame off keeping it factory there is plenty of parts out there, you have to hunt. Give it time...you will find the necessary parts out there. I still struggle to find stuff right when I need it but its available.
Do not rely on the chain stores with kids helping, they just know computers. This place is a mecca of knowledge with lots of helpful folks out there.