8" Taylor Big B. you want the extra separation an 8" gives vs 6" when tied up to a pontoon and another boat wants the separation when you roll up next to them with your tower.
The thru fender is pure fender! no wasted storage space with the eye as in post #3 and it can be brought up tighter for more mounting options. Notice no matter how he tries to lift the fender, it is below the rub rail? This is more about the poor mount location but the eye does not help.
I don't like the pin mounts for most locations. Too many will miss the hole and you end up with gel chips and scratches. A well installed cleat is a much stronger, more versatile choice.
1991 MariStar 240sc, 454, tower, WetSounds, Krypt and Rockford Fosgate