New mfgr; STEEL, not cheazy aluminum. Very limited production. Last made in Pre WW2. Designed from a truck 2 grove crank pulley. Correct keyway and reverse oil control grove. A 4 grove model would be TWICE the price of this 3 grove model. First 5 at this price, then an increase to $450 @. In STOCK now. Each pulley is machined from a one part Steel blank, figure the shop hours. There after, a 12 Week led time for mfgr. If you ever see them- buy one for the future. Paypal or MO. Newc