Step #1 - Use 6mm allen wrench to secure end plate base to each side of bar. Use crescent wrench to stop bar from spinning while fastening.
Step #2 - Install mounting end plates using 4mm allen wrench and 10mm socket/wrench.
When installing the end plates, follow the diagram below to properly fit it to your chassis.
E30 = Both outer bolts
E36 = Both inner bolts
E46 = Both outer bolts
Note - This is to make it fit factory spec measurements strut tower to strut tower. However, your car might have changed over its life so a combo of the holes might be needed for your car.
On E30's, the ends may bend slightly which is ok.
NOTE - x1 E46 end plate is slightly different with an open end and fits on the right strut tower.
Step #1 - Remove trunk side trim to access rear shock mounting nuts.
Step #2 - Remove 13mm nuts
Step #3 - Place one end of strut bar on one side
Step #4 - Rotate other end to either shorten or lengthen the length of the strut bar until studs line up with strut bar.
NOTE - If you are having trouble rotating one end, ensure the inner lock nuts (shown circled below) on the strut bar are loose to give the ends room to rotate.
Step #5 - Secure end plates
Step #6 - Centering the strut bar
With the lock nuts loosened, rotate the center bar clockwise or counter-clockwise until the gap on both ends are equal.
Step #7 - Tighten lock nuts using two crescent wrenches to secure center bar