Hi there,

The Dunlop p/n for the tube is GOB8, with a Sec/Ref of 27A/2311 or 27A/456027.

I have 2 NOS available, please see pictures here: http://s760.photobucket.com/user/dsgaviation/library/Dove%20Tubes

Contact details are in signature or PM me.

Regards

Dave