I have a brand new Fidanza aluminum flywheel for an LS1 for sale. It should fit any Gen III small block (up to 05.)

Fidanza Flywheel

The specs are as follows: (stolen from Summit Racing)

Brand Fidanza
Manufacturer's Part Number 198571
Part Type Flywheels
Product Line Fidanza Billet Aluminum Flywheels
Summit Racing Part Number FIZ-198571
Ring Gear Tooth Quantity 168-tooth
Rear Main Seal Style 1-piece
Flywheel Material Billet aluminum
Engine Balance Internal
Weight 12.500 lbs.
Replaceable Friction Surface Yes
Safety Rating SFI 1.1
Quantity Sold individually.

$300 price does not include shipping.