I've got an original Delta Blower drive, no tensioner arm or idler sadly, but they can be made fairly easily to work. The originals used to fail when the blowers coughed. This drive has been polished in the past but is good and solid to use. It comes with 1 34 tooth magnesium pulley, and 1 35 tooth aluminum that has been drilled to relieve air pressure. Both of the pulleys are 1/2" pitch, 3" wide and in very good and useable shape. Spare magnesium pulley in the picture has been sold. Only includes 2 pulleys. Price changed to reflect. Looking to get $775 us plus shipping for this rare blower drive. Located in Calgary Alberta Canada I would also be interested in trading this for an original Weiand blower drive, unpolished, with the tensioner arm.