Your Kv value will go up by a factor of 3/2.  That's a big change -- it means using two cells instead of three, or three instead of four (and your current will go up by 3/2, too, meaning bigger cells, bigger wires, maybe a bigger ESC, etc.), or a markedly smaller (or markedly lower pitch) prop spinning markedly faster.

Basically nothing will fit.

I'd be way tempted to see if I could send it back, or call them up and change the order if it isn't too late.

Yes, see if you can get the seller to swap it for you.
I would opt for a 2826/10 on 4 cells, and the 12-turn with a 5S battery.
With the /10 on 4S you can run either the 6-pitch or a 4-1/2 to 5 pitch.
Folks are using the 13 x 4-1/2 pusher quite well with the /10 on 4 cells.
Dean P.

I believe my problem is solved.Thanks for all your help guys.
Keith

Keith,

Aren't you a little old to be experimenting with electrons in this fashion?

Just because you have seen a few work well is no reason to give up on the OLE IC.

Paul