The one time use clamps are the thin things that hold the heat shields to the pipes. They have a clip fastener that you have to destroy to get it off unless you can be super careful. Most people throw them out and get hose clamps. If you chase up partshark.com you will find that those clamps have sizes listed in the parts list.I have a rest used them once and keep hearing there one time use. I currently have American customs but plan to get Rinehart next.