Received the front speakers the other day from RetroSound (via Amazon). Pretty tight fit on the driver side, even with the smaller neodymium magnet, but made it work with the Dakota dash. Sanded the oil pressure back housing a little, but no big deal. Won't know if it affects the oil pressure gauge when in use until I power it up. I think some people mentioned it would affect the factory one in that spot because of the magnets?
Going to pop the rear speakers & head unit in soon and power it up to see how they sound. Probably like crap with no windows, interior, etc, but at least it'll give an idea if the little speakers are at least an acceptable sound quality.
I may make a small brace to attach the back corners to the dash , but used pretty decent sheet metal to make the brackets in the first place.