I did not know that the large bolt was easier to obtain. I am in the process of painting a set of sandblasted 71 Scamp 14 inch dog dish wheels. I am planning on running the trim rings with chrome lugs, chrome stems, and a chrome bearing cap. However, I love the look of your hubcaps. Will those caps fit on my rims, and what car did those caps come from? And, are they pricey?
the discs to use are the ones off a '73 Duster etc. when you get the rear end you can easily get A-Body big bolt pattern axles, if you play it right you should be able to sell or trade the small axles for a set.
I also converted my car to a double master cylinder, definitely worth the time and effort. gather all the parts before you start if that's your only car.
the hubcaps I have on my car are off a '66 Charger and take a deep wheel, small bolt pattern Formula "S" wheels will handle them but not much else will. go to hubcaps.com and look around and see if there are any you like and go look for a set. the Charger caps go for around $100.00 a set on ebay.