In "Chrysler World" a RH side part always ends with an even number and a LH side part with an odd number. Further, the RH/LH determination is made according to the part location as viewed from the driver's seat. Torsion bars have the last 3 digits of the p/n embossed into the ends of the bars. Look for 891 or 934 or whatever. There may even be an "L" or "R" after the number - I think there is _ but I won't swear to it. It sounds like you are off "one hex" on your installation. I could describe the process for correcting this on a "regular" Chrysler but not on an Imperial.