Chameleon multi speed set up & frame date code

Just picked up a used cham.,it came with a rear del. hanger for the drive side,but did not include a part on the non drive side.Do I need a part for the non drive side to go multi speed.....
Also does santa cruz use a date code on there ser. #,and or can someone tell me the year (ballpark) of the frame from the pictures that I posted...thx