Where can I find a parts lookup that's equal to a dealer's OEM catalog?

I don't need a listing for 6 types of bumper guards-I'm in search of the ENTIRE parts breakdown for Toyota trucks-for items that NO dealer would stock. Example-fuel pump for 88 pickup truck is easy to find-but good luck finding the entire assembly that holds it into tank-with 3 fuel lines and connections. This is NOT something a junkyard will sell separately. ALL the internet listings are for JUST fast moving stuff-I need listing with PICTURES for EVERY SINGLE OEM part on truck.