Hi Chris and welcome to the group.
Go to Ebay and look there and see if you can find what you are looking for in the fairing as they show up there a lot and you might be able to find the same color as you have now. As for the wiring, that looks like a mess but I dont see the battery and wonder how much of that was connect to it. I for one would replace all the glass fuses by replacing the fuse block. SkyDoc_17 is a member here and sell a fuse block upgrade that uses the mini fuses. It is well worth the time and money to do as it gives you a more positive connection with the fuses.
Above is a link to the forum where he talks about it and shows you the parts.
Next if you havent yet, go and download the service manual for the bike. http://www.venturerider.org/manuals/1986-1993 Yamaha Venture Service Manual.pdf
This will help you in all aspects of working on the Venture and includes wiring schematic and troubleshooting procedures also.
And dont be afraid to ask questions here and look thru the Venture Tech Library 83-93 for more information as there is a lot of knowledge in there from the past.
Good Luck...
Rick F.