what kind of money do the complete units go for? (typically). Is there any likely value for the old units? Also: the H-4 "plug" as on old Volvo's is the same as a sealed beam (as in 7" round) light. However, Pep Boys and others used to sell a "heavy duty" plug, whatever that means, and Wurth Hardware sell a plug (or 2)in their catalog. Wurth are a German company with American branches that sell European parts - often with a sales rep that shows up at the local foreign car repair shop to sell to the shop owner. A little pricy, but several shop owners that I know prefer Wurth spray lubricants, clips, spray paint, etc. to the Autozone stuff...and some things are not really available from Autozone, etc.

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