Aw, c'mon - you can do it!
I Can? It's a job for Albert Einstein. And I'd say you're the one who's got the worst part, giving the answers, awarding the points and tying all the strings together (see, you forgot to award me the points for the connections made 2 posts above).
But I'll make an effort at identfying stuff, but can make no connections.
13 is Isom Dart, I think, a rustler that was killed by Tom Horn (yet I can find no Dart in the cars). And 12 is a Dual Ghia, which could possibly connect it to the Chrysler Cordoba and the Chrysler building.