Help in identifying my truck!

[tobascofred]

I have a "1970" C10 SWB step side (by the registration code, anyway). I have been convinced by folks on this site as well those I've chatted with in person that my truck is made up of a few different major assemblies, some from different years. Examples -
- my options list in the glove box does not show A/C but the dash and engine compartment are factory air.
- I purchased the window regulator for the passenger side and installation instructions for a 1970 show removing two screws beneath the vent wing assembly - the screws do not exist on my doors...
Does anyone know a good web site for identifying various assemblies, to include like tail light assemblies, grill / headlight, etc.?