what bike is it? I just put one on my old 80's Batavus last night. The original bb had two spacers on the non-drive side and one on the drive side. Initially I did not use these, and i was not able to get the new bb to tighten, so I took it apart, put the spacers on the new bb and it fits fine. Not crazy about the steel spacer rings on an aluminum bb, but I'll deal with that later.
Take a measurement on your bb and see if it's shorter than 68.