Need a Replacement, My 7"x 7" Post is Deteriorating

Go to Lowes and get a pressure treated 2"x10"x8' and cut it into 16" pieces (you could have them cut it for you). This will give you six pieces. Stack them up and screw them together two at a time for a block 9" high, 9.5" wide, and 16" long. This is basically what I did for mine. I also made some with a 45 cut on the end for wheel chocks. I did not use pressure treated and mine have lasted for about 6 years so far. Total invested, less than $10.