The old threads should have the info just that Eagle HD isn't around anymore. You could check with Scott at Fitzgerald's to see if he has something. Or try Vreelands HD as they do a bunch of racing parts.
For the front wheel it's kind of simple. The bearings in the Buell front wheel are 25mm i.d. so you'll need a later model front axle or you can have a machine shop turn your 1" axle down. You'll need some 1" i.d. shims that can be found at any Lowe's or Home Depot because the stock spacer on the axle are something like .160" to short. (I can't find my notes on the measurements.) After you get the wheel centered, you can work on the caliper. Just go with the 8 piston caliper. I was finding them on eBay for around $200. I made my own mount for the caliper using some 1/4" steel and some spacers. I made a pattern using some cardboard and transfer it to the 1/4" steel plate. Cut, grind, shape, drill holes and get the spacing right didn't take me very long to do. Of course I almost have my own fab shop in the garage.
The rear wheel is a bit harder to do. The bearings in the wheel are 30mm i.d. and your axle is 1" o.d. so you will need to have a bushing made. The Buell brake rotor is smaller than the HD one. Custom rotor or fab a mount for the caliper. For the drive side, go with a chain drive. You can find sprocket at a number of places. You'll need a spacer for the sprocket too. The sprocket should be for a 530 chain. Vreelands had drive sprockets. Check with them and you can set up whatever final gear ratio you what to run. That kinda it. Wish I could find my notes again.