This is the voltage regulator that came in for the Saab’s alternator. It appears to be a good match in the picture above, but look at this:

It’s missing what appears to be a resistor. Should I be worried? Will this affect charging, or cause interference...?

You may have noticed that aside from the country of origin, the part number is also different. But this is what the parts catalog brought up as a direct replacement. It’ll fit, and the brushes are in the right place, but I’m not sure what to make of that (resistor?).

Oh, and while I have your attention:

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This is the replacement coil that my brother ordered. It came in an Airtex box, but it says PVL, and Bosch on the label. I’ve seen competitor names and part numbers on product listings for cross-reference purposes, but never on the actual part itself. It sure doesn’t look like a genuine Bosch unit, as there are no Bosch logos stamped on it, only the name on the label. Is PVL a sub-brand of Bosch or something, and what does this have to do with Airtex?