T56 steel 3-4 shift fork with bronze fork pads, available as OEM Tremec or aftermarket,
Aftermarket fork is manufactured to the same spec as OE & the country of origin is Korea.
Either fork is the upgraded T56 3-4 steel shift fork used in the Vipers and will fits all T56 transmissions.
Replace your weak aluminum shift fork with a much stronger steel fork.
Tremec part # TNEC0843BFP
Aftermarket part # TNEC0843ABFP