Simply purchase two of these packages and use the widest bushings for the front.
RockShox Rear Shock Mounting Hardware 3-Piece 1/2" for Imperial &
Metric Shocks - 8mm - 8 x 30,0 mm. (2pcs)
The are delivered with assummetric size bushings.
For the rear side, you can use:
RockShox Rear Shock Mounting Hardware 3-Piece 1/2" for Imperial &
Metric Shocks - 8mm - 8 x 16.0 mm (1pc)
I use it with:
ROCKSHOX SIDLUXE ULTIMATE 3P SOLO AIR REMOTE SHOCK 210x50.