Select "Order Parts", then scroll down to the Wiring Harnesses section. That link brings up the following .pdf file. Wiring Harnesses
The first page is about the Factory Fit harnesses they sell. On the second page is a listing for a '67 Ashtray lamp wire and socket. No picture so I don't know if this includes everything or not.
This is the first time I've found any source for this lamp and thought some people might be interested.
