I've just finished restoring my T-air cleaner and will post all the photo's as soon as I get chance.
I spent quite a while looking for suitable material for the "sock". Most materials were too thin, too stretchy (which would lead to the sock going baggy) or made from man made fibres (these tend to burn or melt , not a good thing in a hot engine :? ) In the end I used a thick natural 100% wool material, this doesn't stretch much and doesn't burn easily, plus it's a natural cream colour so looks great inside the black filter. I used the old sock as a pattern and my super girlfriend did all the sewing.
If anyone wants one I have some material left so could make some more.