I have just fitted a set of T bars that I bought off that well known Internet auction site, unused and came with genuine Triumph heated grips installed either end.
I think that the bars are actually Thunderbird bars, and I had to grind a section of the master cylinder away for the correct fit, (actually i say i had to....i lie they were fitted by a very competent mucanik at my local independent dealership in North Devon.)
Now fitted they have made a massive difference to the way that I sit on the bike, so much more comfortable and the front end seems to turn in smoother.