I had a great experience with eBay seller madautoparts-retroworld on a pair of Wipac driving lamps and Gen 1 mounting brackets.

Six days after ordering the set arrived, but they were the black painted version, and I'd specified the stainless steel lights. I requested a return and the seller shipped the correct lights immediately, without waiting for the return to arrive.

After I'd shopped around for the cheapest return shipping, Martin at Mad Auto said just keep the black lights, since the cost was too high. I promised I'd try to send him the proceeds after I sell the lights myself. The correct stainless steel lights and brackets arrived today, August 17. Note that the expected delivery date was August 10-18, so even after shipping twice in succession from the UK to the West Coast, I still the lights I wanted, and on time.

Note that the eBay ad is a little hard to parse on which brand of lights you get. The brackets are Wipac. The stainless steel lights are Wipac, but the black ones are Maxtel.