C6 rear sway bar bushing wanted

Hi all, I am having problems sourcing the rear sway bar bushing on my 2008 convertible, apparently these are discontinued and no longer available in either or rubber or poly, have spent hours trolling the web and Keith Besci has been trying with his contacts stateside but no joy.
Suspension is FE3 HD Z51 sport package, bushing needs to be 25.4mm (1") internal bore oe number GM15241135.
Any help ideas greatly appreciated.
Cheers
Mik

How are these ?

Thanks for looking, unfortunately been on all those sites most are not the correct bushes and those that are correct are all listed as discontinued or unavailable