You could make your own T-81 tracks much in the way this [link=http://www.rc-panzerketten-forum.com/wbb2/thread.php?threadid=243&threadview=0&hilight=&hili ghtuser=0&page=3]fellow[/link] has.

A [link=http://www.rc-panzerketten-forum.com/wbb2/thread.php?threadid=6634&threadview=0&hilight=&hil ightuser=0&page=1]Super Pershing[/link] has also been done by our German tinkerers but it appears a simple straight length of aluminum tubing was used for the extended barrel. I cannot see all of it but it doesn't appear to have the right taper. This piece could be milled by a machinist or someone who owns a lathe.