I have h&r springs and considering same mod.
Do you have post pics of the lateral links and how it works?
By adjusting these together, with the rear toe adjusters, you can bring in, or out the bottom of the wheel.
The camber arm, adjusts the top part of the wheel. It pushes it out, if you have negative camber. Wheel gets closer to the fender.
This idea, it was given to me, by K-Mac's owner.
http://www.k-mac.com/
He told me that this way is better because you won't have scraping issues, if you bring out to much the top part of the wheel. That is, with camber arm adjustment.
Arms are original Mazda parts ~$45/each, ALL56196- 5/8 double adjusters ~ $13/each, 5/8 - 18 RIGHT/LEFT Handed 1.00 OD. X .095 WALL Tube WELD TUBING BUNGS- $26/4 PCS.
All purchased from Ebay. Some old guy, with good reviews on Yelp(ex JPL welder) welded all four of them, for $20.
If I remember correctly, I had to cut out 2-1/4" from the arm's length.
By the way, I have CS springs, you may not need this setup, with H&R.