I still don't have a new stereo in my car.
I called the vendor, explained what had gone wrong, and the nice chap on the other end of the phone got things sorted out to send me a harness adaptor. Unfortunately, despite my giving him the correct part numbers... but that's getting ahead of myself. The first thing was timing. He reckoned that sending it via standard shipping would have it here by August 2nd, which was last Friday. Friday and Saturday passed with no sign of it, and I'd given up hope this morning when I decided "Screw it, I'll just plain BUY the correct one, and return it if I end up with two."
Well, I'm not going to end up with two. The situation is that there are two potential stereo harness adaptors for a 1994 Volvo 940, and which one is correct depends on which stereo was fitted at the factory. I need one that we'll call Type A, since it's the older version; the vendor's website offered me a Type B, and hid the Type A's existence. I was pretty sure when I got off the phone that I had a Type A on the way, but it failed to arrive as scheduled and I had no tracking information.
And so, I was a little annoyed when the Big Brown Truck Of Where Is My Stuff pulled up, and the driver hit the doorbell and ran. At least he hit the doorbell; UPS has a less-than-stellar record in achieving that. Anyway, I opened the large envelope, and found... well, let's call it a Type Q. I have no idea what vehicles it fits, but I can assure you that mine is not among the set; it's described as being for some vehicles from 1999 onwards.
So I shall wait a week or so for the correct harness, and in the meantime this one will go back to the vendor, since it's not for me.