These front & rear (RCA) lowering blocks' intention are for camber correction, your car has to have coil over suspension        
and 17" wheels or bigger in order to install these camber correction.  The front blocks lower your car by approximately 1        
inch, so you have to adjust the coil over suspension higher by 1 inch, rear blocks lower the car by 3/4 inch, so you adjust       
the rear coil over higher by 3/4 inch, then your car will have less camber.  
The rear camber kits are adjustable, each kit come with three difference inserts, 1 center insert +2 degree, (1 insert off          
side: you can flip this insert to have minimum or maximum correction +1 1/2 or +3 degree).  1 insert with both cut off can       
also flip to have + 1 3/4 or +2 1/2 degree.  Which inserts to used determine by how much your car camber.

 Important note:  You have to align your car immediately after you installing these kits,               
                                driving without aligning can result in severe tires wear & handling issues!
LEXUS GS RCA (camber correction kits)
EXACT front RCA (lowering blocks) for
98-2005 Lexus GS.
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The insert has to flush with the hole.
Please note how the block facing when you
insert the inserts in the hole!   Choose the
inserts that best for your camber.
Assembly the RCA to the rear lower control arm.
Install & torque the bolts according to the instruction attach with the purchase.  Recommended to bring both side toes all
the way in, so when doing alignment will be easier to adjust them out.
Recommended to bring both side toes all the way in before installing the rear RCA, so it will be easier to adjust them out when  
 doing alignment.   Install & torque the bolts according to the instruction attaching with the purchase.
Install the front RCA to the front lower ball joint like these pictures, then torque the bolts according to the      
instruction attach with the purchase.
 
New EXACT Rear RCA complete kits.
1st left +1 1/2 degree
2nd left +1 3/4 degree
1st right +3 degree
2nd right +2 1/2 degree
center +2 degree
 
Five different degree from:
+1 1/2, + 1 3/4, +2, + 2 1/2, +3 degree