They did not offer it for this car in 1966 but I would like to add one.

Is there a kit available or what can I use from say a 1968 model or other that will work?

Thanks in advance.

Check th '66 accessory catalog
http://www.hamtramck-historical.com/1966AccessoriesCatalog-01.shtml
This is the one that fit's '68- '70 B bodies. Pull out the ashtray and see if you have perpindicular slots about 3/8" long and 3/8" apart(actually it's a square hole) . Lamp lead plugs into instrument lamp harness (orange wire) and dims by the instrument lamp dimmer switch.

Thanks, but is there a kit/part I can order new today?

http://m.ebay.com/itm?itemId=360481190307
This one says it fits '66. A little expensive tho-
There's also a listing for a used lamp- $25 shipped. Search mopar ashtray light.

Thank you.