I just sent an inquiry for PN# FJ3-RCC which is the front spacer and rear coil 3" lift.
I was also looking at the PN# FJ3-FRCCC front and rear coils + front spacer 3" lift.
Chris at Toytec support, recommended the PN# FJ3-RCC if I were to keep XREAS.
However, his reasoning behind it was kind of odd:
He said "The XTREAS front shocks really are not designed to accommodate the heavier OME coils rates included in the FRCC kit"
From my understanding the XREAS shocks are connected front and back, so Im not sure what the difference is between the front and rear coils. If the front coils are too heavy and the front XREAS cannot accomodate them, wouldnt the rear be the same situation?