Baja Motorsports BR150-1 Assembly Guide - Manual (Page 8)

8. Attach rear shock absorber where stabilizer bar was using
M10x43 bolt and M10 nut on top bracket and M10x45 bolt and
M10 nut on bottom bracket with 33ft.lbs. of torque on both.
NOTE: The other rear shock absorber will already be attached at
the bottom. You will need to attach the top of shock to frame.
7. Remove rear stabilizer bar and throw away.
Stabilizer bar is for shipping purposes only.
NOTE: There is only ONE stabilizer bar.
Rear stabilizer bar
Rear shock absorber attachment