Regarding the adjustable arm, I should be able to use the SPC arms under rule 15.8 H, which says that linking arms can be replaced, as long as they meet the bushing requirements.
As for the rear brakes, per the rules, a drum to disk conversion can be performed as long as the disk diameter is greater than drum OD, and the replacement system bolts on, it can be completed. So I couldn't do the fronts, but I think that have a disk set up for the rears would make PDX's and mountain drives a little more enjoyable.
Parking Lot Hero
2008 WRX daily driver
2003 ZX3 23D Autox Car 42 FSP
"Hella Functional - Raced, Not Hard Parked"