The headlights are horizontal on the buick, plus I crawled through the divider window and dug an old insurance slip out of the glove box that said it was a 60 also. We're not sure of the builder though, as we couldn't find any emblems or body company tags on the car.
On the superiors we were able to locate and photograph all of the body tags. Couldn't locate the one on the eureka, but it did still have it's emblems on the quarter panels so we know that it was a eureka from that.
It was really cool to find the Q siren still mounted under the hood of one of the superiors. The guy running the yard said that the 66 MM was driven into it's spot and it does look like that's a good possibility. Out of all of the cars the 66 is in the best condition with some floor rot, otherwise complete and pretty solid.