Cryo Tank Insulator Spacers

[weeeds]

In the vacuum space of some cryo tanks are non-metalic insulator sleeves used to help center the inner vessel while providing a thermal barrier.
Does anyone know where these can be purchased in North America?
Thank you

 

[unclesyd]

You might want to give these people a call.

http://www.taylor-wharton.com/Index.htm

 

[claybo]

Make them yourself out of blocks of virgin teflon, or phenolic.