Cassette ss spacer?

[nameused]

They're just spacers to move the gear and hold it where you want it. You should have received spacers when you first received the ss conversion kit. They look like this http://www.amazon.com/Wheels-Manufacturing-Speed-Conversion-Spacers/dp/B000C1927O/ref=sr_1_15?ie=UTF8&qid=1293431456&sr=8-15 . There are many different sizes to pick, so make sure you get the right one.