Dewalt dw8001 RAS rubber flexible dust bellows?

[Alasdair]

Hi there don't suppose anyone knows where to get a replacement dust protection bellows/gaiter for my dewalt saw. Its fitted to the rear post and mine is now in bits. Can't find any ref re part number on any of the spare part diagrams I found online. May be discontinued? Its the last piece I need to finish restoration or any ideas of what might do as a replacement
Alasdair

 

[Alasdair]

Found a part number dewalt 863261-00 but no longer available although also found 863324-00 which looks the same but cant find any dimensions?
863324 looks like

863261 looks like this