Service Manual Isn't on MyMopar

Classic Industries has 76 Plymouth manuals. #L2133 $100. $50 on CD rom.#CDM6816
That is the same one that is on Ebay for $15, but I figured it would not be specific for the duster since it says chrysler, plymouth, and dodge. I am having trouble with certain wires. Do you think it would be good enough to help me fix a few missing wires under the hood? I have no experience following a wiring diagram, so I am hoping a service manual will be very detailed.