This is my first purchase of bearings for any motor so this process is foreign to me. I am looking at the Z1 site getting ready to order, gathered all my stamped #'s on the caps, crank and block (pic below). I guess I don't get how Z1 will want me to organize this data into the comments section and if it's as simple as adding those two numbers together and making a list. I am making something harder than it should be! I am only concerned as a mistake on this level may be crucial. Help would be greatly appreciated.