I think that those are the superseded numbers, applicable to BB Nova applications as well. Originals were 3950113 LH, and 3950114 RH, if I'm not mistaken.
Pics included below are GM NOS 3980941 and 3980942, stamped numbers shown. I do not see either one stamped as LH/RH, just the part numbers.
Hope this helps -
Regards,
Steve