Factory P/N's for wiring harnesses

Hi guys, Sorry this is B-body stuff but Im not a member on FBBO. I just got a huge bin full of factory wiring harnesses. Most of them are 68-69 B-body, but Im trying to find out if there is a website that I can cross reference them thru just to verify. I have all the P/N's that are on the tags, but Im not finding a lot just typing those into the net.