This emblem is NOT Skylark, which has (three) thin posts at the upper corners and mid bottom. Perhaps it is a Wildcat decklid emblem or Rivi side emblem. Dan http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&category=33643&item=2461799901
Dan I do not think is is a rivi emblem. I think the Rivi's had the Name spelled out. I may be wrong but There is a 66 riv GS here locally.
I paid about 95.00 for a set(front,back, and sides) included S&H I believe Gorden is the source for GM restoration Parts for these items also has "Skylark emblems" Very nice. Chuck
this is from OPG catalog Front Grille `66 Gran Sport emblemart#S230209 $39.95 Rear Tailpanel `66 Gran Sport Emblemart#S230132 $29.95 Quarter panel `66 GS emblem (3 post)art#S230117 $26.95 `66 Dash GS emblemart#S230123 $26.95 They also sell the `65 Gran Sport emblems. Thanks