Which water control valve?

I hear ya on that, 67Dart273! Most counter people at the local parts stores don't know jack that their "catalog" doesn't tell them and that's misleading. There's one guy in each of my local stores that I'll deal with. If he's not there, then I know I'm going to hold their hand to get what I want. At O'Reillys, it's James, at Advance, it's Mike, etc. At Autozone, Wayne is building a '71 'cuda and knows his stuff about Dodge. Anybody else is an idiot. Unfortunately, my local NAPA keeps banker's hours and doesn't open on weekends so I don't get much from there. Usually, I try to research what I need, mostly through forums and what manuals I can find online, and then give them a part number to crossreference or go ahead and look it up and tell them there part number. If it's not in stock, Advance insists that you pay at order while my O'Reillys will order it and you pay when you pick it up. If it ain't right, no big deal, they just put it on their shelf. At Advance you have to go the trouble of returning it, getting your money back, and then reordering and paying again.