[67L78conv]

Group 10.185 Part Number 3961371 shows as remote mirror for-

64-66 All (exc. Pass)
66 Pass w/C.C. equip. (exc. Caprice),
66 Caprice (Sta. Wag.)
Requires 1966 controls when adding to a 1965 vehicle.

Other Mirror info-
Group 10.185 Part Number 3899857
1967 All (exc. Pass) Outside (remote)
Group 10.185 Part Number 916500
1967 Pass (outside remote)
Group 10.185 Part Number 3909100
1967 All (exc. Pass.) Mirror Unit, outside (remote)

This information is taken from the 1970 P&A

Hope that helps.