Like the ones in the pic below? If yes then you need to buy these separately and Triumph, Motone and Tec Bike Parts all make them. Not sure if they will fit a 79 t140e though. Links:stuart
tubing that bolts to the top of the shock and goes back about a foot and bends down to the rear foot peg. This I think helps keep the bag off the wheel and give you something to tie on to. I think ??