This NOS Shimano Ultegra hub has been in my stash for decades. I bought the 2 thread on small cogs with the hub but never used it. Now I don't remember if this is a 6 or 7 speed and what spacers are supposed to be used with what cogs. A short time ago I built it up with a new CR-18 rim thinking I probably had the cogs to finish it off. I do have a bunch of the old gold and black 6 speed cogs but I have long forgotten what spacers and cogs were designed to go with it and will appreciate reminders. Thanks.