If it has IRS, then the springs should fit. There's between 25 and 40mm difference in the ride height of an AU3 XR and an AU1 anything, so be careful with the shocks. The springs on the AU3 are roughly equivalent to King Lows, so they should be OK with the standard shocks - test it and see. If the ride's no good, just put lowered shocks in.
AU1 XR8 Auto 147.9 rwkw (approx 215 fwkw)
AU2 Wagon HAD Auto
17s, Pacemakers, 3" Intake & Pod filter (The Family Hack)
FPV-XR Club ACT