It sounds like you're planning to use the minimum of spacer thickness? That usually means the thin cheap aluminum ones. That what you're working with?
If so, see if you can find "good" ones, or at least some that are better than most. Since they're so inexpensive to begin with, maybe this gives you some leeway to pay more to get more. I don't know if that's possible, but some of the cheap ones are known for cracking under stress.
Not sure what your intended uses are for the Bronco, but if heavy use or off-roading or larger tires are involved, you might want to just step right up to the really expensive spacers and forget the longer studs.
The expensive ones, as you may already be aware, use the stock studs to hold the spacer only. This spacer type has it's own studs for the wheels, so length is not an issue even with a 1.5" or larger spacer.
The downside (aside from price) is that they are usually thicker than you need. Starting at probably an inch and going up from there. We sell the 1.25" model:
http://www.wildhorses4x4.com/product/Aluminum_Wheel_Spacers_Kit_Blue for just such a scenario.
It's large enough to clear the largest typical rod-end, even with fairly offset wheels. Without the need to match them in the rear if you don't want to.
Some do use all four to keep things consistent, but most only use 2 at the front. A slightly wider track in the front does not seem to cause any issues.
I realize 80 bucks is more than 10 bucks, but it's still a lot less than most wheels, so it works out for most.
Paul
