Do a search
From what I know, the letter and number combination (K66/K55, etc.) has to do with the angle/height/cut of the rail cushion. Do some google searches and you will find anything you need. There is a table mechanics section on the forum as well that can give you some answers.
Also you might want to look in to your cloth choice. most prefer the simonis 860 but maybe you dont. There are differnces in the cloth and speed will be affected by your choice. I just want to be sure you get what you are looking for because it is a pain and expensive to have re-done.
