What size tire do I need?

[Trip59]

The tires in the pic below are 205 70 15 the wheels are (of course) 15" but I'm not 100% on the width, either 6 or 6.5. I have a set of 7" rims, but the backspacing doesn't fit on the front.

So, the plan (and here it gets tricky) I have three ok tires and three ok rims. the one bad tire is on one of the good rims, and the one bad rim has one of the good tires on it. Those two are coming off the truck and will be swapped and saved as a spare. The rims look nearly identical in appearance to the others I had (what a coincidence), so I'm going to take the two good tire/good rim pair and put them on the front, and the two bare rims, with new tires, in the rear.

I just lowered (half done) the truck but can't do an alignment yet, so I'm not looking to put new tires up front, and hopefully within the year I'll be replacing the wheels all the way around, I've picked what I want, but at $90 a piece, plus new tires, it's not a 'right now' purchase when I can get by for another year with by just buying two tires. And yes, I will be getting it aligned within a couple hundred miles after the drop, I just have to fix or replace the gearbox first so I don't have to argue with the techs (I used to be one, so I nkow it can be done, but they'll half-ass it and say it's the best they can do).

So, 7" wide 15" rim, same height or a bit taller, what size?