Changed mine out but went to a plumbing supply store used by contractors to get a model close to the original. The new one sticks out into the shower about an inch farther though. The main problem I had was trying to use the old fittings (don't even try) save yourself some headaches. The new pex fittings and pipe worked perfectly. I did have to open up areas above and below the shower valve. Went to Tap Plastic for panels to cover the openings. It worked well and looks nice too.
2003 Itasca Suncruiser 33V,
8.1 Workhorse, Koni's
2004 Honda Element