Here is an Ebay auction for another used Hipo counterweight and sprocket by Ebay member "acond classic american auto parts" with a Buy-It Now of $489.00:
This is an original Ford vintage crankshaft hatchet weight and lower timing gear which is correct for the HIPO 289 engines. This is correct in every detail and all original Ford. Almost all of the gears you see for sale are actually a non Ford standard crank gear which has been milled down and drilled, not something I would want to trust! This slightly used gear has almost no wear on it. Correct in every detail.
64 65 66 67 MUSTANG HIPO 289 CRANK TIMING GEAR AND HATCHET WEIGHT ORIGINAL FORD | eBay
-Fred-