The Ballast Resistors I have are NOS (New Old Stock), from an original Chrysler Supplier (Colber Corp.), with Part Number 3874767 stamped in them (and, as mentioned in the original post above and in the ebay listing, also have the "blank" ballast resistors available as well).
I'm not aware of any company currently producing these ballast resistors with Part Number 3874767 stamped in them. I do know the quality of these ballast resistors, and have spot tested them to ensure that they are not defective.
