My new to me '95 R100GS has two exhaust leaks that I would like to address. I would like to have the new parts before I tear it apart. Questions: One leak is at the exhaust pipe nut. Do I need both 12. clamp ring and 13. compression ring? Also, I need gasket 8. Is there a part at the parts store or exhaust shop to sub for this that is not 13 dollars? I hope this effort to be prepared will not jinx me with my exhaust pipe nuts.