Not Ranked
Mark, are the part numbers that closely researched? This one looks exactly right for a COB car to me. Every COB car I've managed to research has had either top adjust or bottom adjust, doesn't seem to be any rhyme or reason to it. I'm pretty sure they will just have used whatever Smiths sold them.
I hope the new owner of this one is careful to change (or at least register) the positive earth polarity...
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