1968 Cutlass S Trunk Emblems?
 

Help!!

I have a 1968 Cutlass S Convert. There is one Cutlass Emblem on the right side of the trunk. There are two holes on the left side of the trunk which appear to be for a second Emblem. Can someone tell me what emblem belongs there (Oldsmobile?) and if this is factory original. Thanks for any insight you may have. Roland