Don, I'm sorry the BB isn't working to host your photos. I've always felt the requirement to relinquish rights was not worth the effort, and that was my original incentive for using my own hosting.
The offset is subtle. There are two places to put a rivet holding the lamp contact, and only one is used in either location, making the bulb replacement choice an easy one -- same bulb in both places, but different use selected by the contact installed.
I don't know what years had what. I think these pics are from a lamp removed from our 84 before sending it to Valhalla, but I could be mistaken. Also, I think the bulbs in it were the ones installed by Volvo at the factory! But my thoughts are only based on the appearance.
Edit: Checking owners manuals (79,83,84) the lamps referenced are the single contact 67 and 1073 bulbs, yet these Cibie housings are definitely not those that fit the 86-93 body. The owner's manuals have a lot of copy/paste errors over the years, so I'm not too surprised. Someone will know when the lamps changed from single filament to dual filament.
I just jumped in because I remembered there is an important distinction between "single contact" in the socket and "centered single contact" in a socket built for a single filament bulb. It wasn't coming through in the thread's text, so here are some photos.




--
Art Benstein near Baltimore
What engineers say and what they mean by it:
Engineering says: "Close project coordination"
Engineers meant: We should have asked someone else; or, let's spread the responsibility for this.
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