Exhaust collars

[pilgrim]

Ok, I've not seen this pop up on here before so may be a new issue for older  Gen 1 Fazer |Thous.
The exhaust collars on pots 2 and 3 on my bike are in what can only be described as shit state. Pots 1 and 4 are fine, look almost new, but the middle two are in such a bad way that harsh language would probably make them  crumble away to dust. Other than that the rest of the downpipe area is fine, exup valve free of stickiness, downpipes nice and shiney etc.
But, as the collars are designed so that they just don't come off, has anyone seen, or have a solution to replacing totally goosed ones without forking out for a new set of downpipes, whole exhaust system blah blah.
I have visions of crappy exhaust sealing and that irritating ticitty ticcitty ticitty tick noise when the poor old things become too weak to do their job properly.
Suggestions/ advice please.
 

[bristol banger]

Not sure about Yamaha but on a Suzuki I had the two middle collers had a hole big enough that it allowed the collers to slip over the end of the pipes, when on the pipe there were two half round inserts that sat in the collers that then stopped the collers from sliding over the flange.

[bludclot]

maybe cut the old ones off and have new ones made up? perhaps designed in two halves and 's' shaped length ways so as they overlapped each other.... a small project for a machine shop?

[solorider]

were yours as bad as mine was?

[bristol banger]

Jesus, has that been parked on the titanic

[PaulSmith]

Isn't that the way they are supposed to look?

[pilgrim]

Yes. They are that bad

[solorider]

Yes. They are that bad

All 4 of mine were that bad, I had to cut the pipes off in the end, the pips would not in anyway come off in one piece, and I had to replace all the studs and nuts, only one nut was recognisable as a nut, the rest had simply rotted away.

[bludclot]

how difficult was it removing the studs from the head?

[snapper]

how difficult was it removing the studs from the head?
simple get some one else to do it