A former member who was apparently enough of an ASS to get banned gave me some rollers to help me get some miles while watching the little one at home, but he has no idea which brand it is and it needs a belt. Figuring there can't be all that many variations, and there must be some stretch room for adjustments to length anyway, anybody know where I can buy one that will fit? They are aluminum rollers about 4" in diameter if that helps.