You can get a hold of California Customs Body & Paint they are located in Ontario, CA I've heard they do really good work. I'm not sure on the prices though.
If you ever plan on painting over a rattle can primer you better plan on cleaning most of it off or it will end up causing issues with your paint. There are a lot of good cheap primers you can spray with a gun even a cheap gun from say pep boys
I just measured my 69 and I got 35.5 inches from front to back and 66.5 in a X pattern. I' m not sure if there is a difference in 68 and 69. I hope this helps
Thanks for the link 73abodee I got all the info except the paint code and the upper door frame. It still doesn't really say which sub model it would be if any