Welcome to the forum!
I too grew up in Fulton, MO and yes trying to find parts around there or getting someone that knows stuff that far back or good salavage yards that have jeeps, is going to be an uphill battle, this is not a slam towards anyone, just most of the parts store's now days, if the computer doesn't show it, we can't get it.
If you order some of the speciality items, from Quadratec, Morris, 4WD, etc. you run into the shipping cost, so save up on your orders and they usually run specials, (X) dollars free shipping or every couple of months get free shipping. Here is the Jeep Forum 5% discount, when ordering from 4WD, (Ju4wddis1). I haven't used it in a couple months, it may have changed, updated. But it will help on the sales tax or shipping. Just to give you a heads up, on on-line ordering, what is discribed on their web page and what you may get, my not fit exactly, or mislabeled part, this is usually far and few, but it does happen. Of all the parts that I bought on line, it happened to me 3 times out of 20 or so orders. Check you parts as soon as you get them and if needed, they will usually work with you to get you the correct part. Some online stores, you have the cost out of your pocket to send it back for them to review the part, to decide if you will receive a credit or new part shipped. Also, I learned that after 30 days most online stores won't take the parts back, if they are the wrong part, so be proactive. I don't want to put fear into you, but be proactive, so it does't cost you more in the long run. Most of the places listed or noted on here will try to work with you, if the parts are not correct.
Your best bet is go with NAPA or O'Riley's, they should be able to use the Parts Catalog books to lookup and cross reference if they need to, and yes they usually will have to order it. For this you may need someone willing to spend a couple of hours looking at 3-4 books to get you the right part.
Your Auto parts store (off the shelf) repair manuals will not go into alot of detail, even the jeepers bible, had an older jeep that it referenced its information too.
If you are wanting to buy a book, have the library order on in for you to look at see if it is as detailed as you want. Then you can go online to buy or go to the Barnes and Noble route to look at it or buy it.
You will spend a lot of time on the internet, this site is very helpful and a lot of very helpful and knowledgable people are on here as well.
The site has helped me with my 84 build and I am all so diving into the wiring mess as we speak.
PM me, I might have some info that I can e-mail you, that might help.