Just a couple of washers on each side. You may not need them but if you do, it is super easy (I can say that now). I got the same seat you have coming. You are gonna love it.
Phil, GLAD to hear that it was a simple adjustment. This is normal for some Corbin seats. Looks very nice
Successful people build each other up. They motivate, inspire and push each other. Unsuccessful people just hate, blame and complain.