Need measurment on Rockwood outside shower

[dirtman7]

I would like to replace the outside shower on my Rockwood 8280 with replacement from Dyers that allows a water hose to be utilized. I noticed they sell fixtures that are 4" on center and 3 3/8" on center. I'm currently in Florida and trailer is back home in Ontario. I would really appreciate it if anyone has easy access to see what the tap widths are so I know which unit to purchase.
Thanks