Part Number 172-5 for 98-00 big twins except the TC88B . So thats the last of the Evo's and the first of the TC88A engines . It provides a smoother shifting movement and eliminates any false neutrals . It's a straight bolt in piece and the details can be found at bakerdrivetrain.com/5-speed-drums
It appears new but the box is shop soilled . Was a mis-ordered part for a US shop I deal with and ended up in the ton of spares I bought off them . Yours for only $125 .