Seems to me I got the rubber for my BT7 at Moss, but it could have been someone else to. The rubber was not a problem installing - the problem was with the felt that goes inside the tracks - you had to cut it to size and it was very difficult (at least for me) to install, I was never satisfied with the job. I think I would have been happier with buying new (although I have heard they are not quite the same) or reconditioned
Bill L