Diy
Years ago I took a 2x4 and cut a notch to fit over the dock post support. I attached a bumper strip to other side. Then I drilled through the dock post into the 2x4 and attached with a galvanized 1/4 x 4 1/2 inch lag bolt. One toward the top, one toward the bottom.
On the sides where the pieces met, I marked (waterproof marker) a number on the post and 2x4 so when I put them together every year the bolt holes were always lined up. With a powered drill I would drive the bolt through the top hole of the post until it just started to stick out the other side. I would line up the hole in the 2x4 and then finish driving the bolt. The bottom hole lined up automatically.
After many years of use, 15+, the bolt holes got a little loose and I replaced the 1/4 inch bolts with 3/8.
It took about 2 minutes to attach each bumper and 30 seconds to remove them. The system lasted over 20 years and was still OK when I sold the house.
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