no problem if you ask the guy in the store. Show him your pic and tell him that you want to replace with ball valves. He will give you the right stuff.
If you don't trust the sales help in the big box store, go to a plumbing supply place.
edit: oops, I didn't see page two before posting this...but it's still good advice.
Last edited by slownsteady; 03-25-2014 at 08:50 PM.