Yes it's a fact, my little intrigue is that with 1 5/8'' rails I should choose the K66, but all high end tables have K55, there must be a reason for that, the K55 cushions are bigger than the K66 and can surely take bigger hits. Here I'm lining up to do a big rail job and I really want to get the best results with what we have to go with, it's not a problem for me to put the rails at any height and nose of cushions too, the only thing is that I have no right to be wrong, that's a bit of my worry.