all you got to do is buy a normal delta faucet with the standard 8 inch spread.
the delta facuet brass arms can be cut between the two sections and extended outwards with just normal 1/2 copper couplings to the size you wish to make it.
Yes thats right, they are made that way to the exact size of 1/2 copper so
they can be extended with copper pipe and couplings. Aint it wonderful!!
It just requires a tubing cutter and the ability to solder properly the copper extensions in between two or three faucet bodies.
If its a three handle faucet you are replaceing for either a tub or shower,
I suggest that you use a two handle faucet and put a Delta faucet Deco plug over the center hole. And use a pull down diverter spout that also comes from Delta.
Also take the plastic parts out before you solder this little thing up so you dont overheat the parts.
good luck and have fun fun fun
this has gotten me out of many jams with old funky faucets.