I have sourced several parts for my truck from LMC, and all have been of good quality.  VERY happy with the door gaskets I received several years ago.  I live nearby so do all my shopping in person.  I can say that in my experiences, the people there knew their stuff.  Their catalog is great for knowing what you may run into when disassembling parts of the truck, like the interior.  They have all the fasteners you need to match existing.

From the vendor:

"Long Motor Corporation has over 30 years in business, and with over 30,000 truck parts in stock, we ship most orders complete within 24-48 business hours. Our truck/SUV part catalogs are the most detailed, fully illustrated and accurate information source available anywhere. Some customers say our catalogs become their restoration guidebook."