The only way to get hubcentricity on the outside rim is to bore the rim and get spacers with a lip turned on them. Then you can't rotate your rims/tires. Or, you could get another set of rims and weld a thicker, tapered lug hole plate on them. Then you can have lug centricity on the outside. I messed with CAD software for a long time trying to re-invent the wheel, or wheel spacer so to speak, and never came out with a good idea. I ran the 1.75" spacers on the 2002 for over 100,000 miles with them and towed the crap out of them. They are 6061-T6 AL. I guess you could get the steel ones if you want more strength, but I've never seen any cracks in either of them. Keep in mind, the wider the wheel, the more stress you'll put on them.
My desire back in the day was to find longer studs that could be pressed into the factory hubs. Then a simple plate with 8 holes could be made at any width. The thing about spacers is that it is a PITA to rotate tires. It adds another 16 nuts. Whenever placing the outside wheel, I'd just put it up there and lift up just a tad and try to get it as centered as possible when mounting. No way to get it perfect. A little shake....yes, sometimes. The shake will change every time the tires are rotated.
I've also heard, but never confirmed myself, that you could use Ford rims on the outside since they have a larger center bore. Then you could get spacers made with the ring on them.
