Panel wiring questions

[mr57]

Got a question or two for the wiring gurus here.

I have a 64 swb Chevy panel that needs some help with the wiring. First of all there is nothing going to the taillights, just wiring hanging down behind the rear wheel wells. I probably will try to go with a repro harness, but is there anything different between the panel and a regular truck? Other than the taillights seem to sit a bit higher?? Are there repro harnesses available for this application? Either a panel or 'burb?? I did a quick google, but couldn't find anything definitive one way or another.

Second question is this. Soemtime in it's past the front sheetmetal was swapped out for GMC parts, and I kind of like the 4 headlights and would like to keep it. Is there a specific wiring harness for the four headlight system? Again, it looks like parts of it were robbed at some point in time and a new harness would be the best option. GMC specific??

Thanks in advance!