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The spacers fit between the mounting points on the frame and the lugs on the brackets to space the exhausts away from the bike. If you don't fit them the exhaust will foul the tyre when the suspension is in compression. They should be there on the existing exhausts. Some people have made thicker-walled spacers because the existing ones can allow vibration which may lead to bracket failure. One ex-member of the site had several sets of brackets because he did not ensure they were properly fitted - fit the exhausts loosely and adjust the pipe run correctly then tighten the link pipe connectors (jubilees) and the pipe into silencer box lastly tighten the brackets which hold the box itself.
This method has worked successfully for a set of CCC carbon longs on one of my bikes and the CCC carbon stubbies on the other bike. I did not use thicker-walled spacers.
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