(The link shows 5-in x 5-in, and I want 4.75-in x 4.75-in.)
I purchased 2 5-in x 5-in fence posts, cut them in half and installed them(filled with cement) as posts on which to mount some water and electrical components.
Everything went well until I tried to put caps on them. Apparently, one of the posts was from old stock and was 4.75-in x 4.75-in. I did not notice this when I made the purchase. The 5x5 post caps are too large. The only 4.75-in x 4.75-in caps HD is able to special order are of a different style. I will use them if I have to but prefer to use the same style as all the other ones I have installed.
It is too late to replace the mis-sized posts with true 5x5s.