These lightpost don't fit my fence post cn you help wiith any information to fix this?

This post cap is not designed to fit on a 5x5 post. We do have many posts caps that will fit that post size though under our Deckorators brand.

Unfortunately this product is only compatible with fence posts of the following sizes; 3-1/2-in x 3-1/2- in, 4-in x 4-in, 4-1/4-in x 4-1/4-in and 4-1/2-in x 4-1/2-in.