Storm door lockset

Hi, I bought this replacement last time and it got discolored again. Also I had a really hard time with the back side and had to use the old backs with the new fronts, don't remember the exact problem it it would close or lock or lineup on the locking part. Do you have a recommendation? I think it's a guardian door maybe. One that will fit more easily and won't discolor so quickly, it went bad within the first 6 months I just didn't have the energy to take it off and send it back.