So the diverter in my last spout failed and I couldn’t get a repair kit last night. I did get sold the idea of replacing the old spout by my wife. I replaced the spout after the old spout and pipe were I’m assuming 5 1/4 inch as I’ve gotten a 5 which was too short and 5 1/2 which feels like a thread too long(see photos.) what’s concerning is with the 5 1/2 is it works fine on bath tub but when I turn it onto a shower mode it leaks out the back of the shower now. I’m wondering if I missed something? I did plumbers tape on both ends and everything screwed together just fine