Do you have the whole thing? Rusty of the memory of that but I think you take the lighter out and chrome tray and it is just nuts and screws with some fussing. Should be similar parts to other GMs of the vintage so should be able to keep it original.
If you need an original lighter and socket PM me and I may have a set for it,
T
Tom Greenleaf - MetroWest Boston - USA
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http://www.autoacsystems.com/tomgreenleaf/