Bill, I've done some work with E-flasher switches and found there are two different kinds used in Panteras- mixed not necessarily by date. Type 1 uses a metal 'cage' that holds the two parts of the switch body together while type 2 uses 10 plastic detents within the switch body. The first can easily be disassembled and altered to work again, while the second cannot without a LOT of trouble, and the guts of the two are quite different. They work identically but nothing interchanges except the dash attach ring and the bulb.
Next, the BMW and Alfa Spyder e-switches seem very similar to Panteras, but some of the embossed wire numbers on the back vary. Dunno if the internal construction is similar but an Alfa switch works fine in my 72-1/2 Pantera L. Note all this adapting may be for nothing 'cause the stock e-switch is a part recently reproduced by Wilkinson, priced quite cheaply.
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