The replacement is pretty striaght forward, assuming it is like the cast ones on the other 5 speeds. Remove the cable by removing the clip and pin. There is a nut on top of the jagged round hole. Remove the nut and either use a gear puller or some gentle prying to loosen the taper fit.
I looked at my 98' bug and don't see this part, so I can't help you with the part number.