Can you use this knob on OTHER Penn international reels?
Yes and No.
NOTE about 16VIS reels: I did testing trying to put the larger 25-50VIS onto a 24-16VISX handle. It does NOT fit. The #91-16VIS rivet is skinnier than the inside of the shaft on the 25-50VIS knob, so it's too loose, which would destroy the handle if used. The correct diameter 91-50VIS rivet cannot be used on the 24-16VISX handle blade as the connecting point is too large, so that is not a solution. Sorry! ~Mo, Parts Dept.
91N-50 and 91-50VIS rivets DO have the same size connecting point.
Reels that already have either the 91N-50 or 91-50VIS rivets in them CAN use the 25-50VIS knob but other parts will also need to be changed, so see the 25-50VISSP kit that we put together for that substitution.
91-50VIS fits: 20VISX, 20VISXS, 30VISW, 30VISWS, 30VISX, 30VISXS, 30VIW, 30VIWS, 50VISW, 50VISWS, 50VISX, 50VISXS, 50VIW, 50VIWS, 70VIS, 70VISS, 80VISW, 80VISWS, 130VIS, 130VISS
91N-50 fits: 10KG, 10LD, 130VSX, 15KG, 15LD, 24KG, 30S, 30SW, 30T, 30TW, 30VSW (Newer), 30VSW (Older), 30VSX, 30VW (Older), 30VW (Newer), 50S, 50SW, 50T, 50TW, 50VSW (Newer), 50VSW (Older), 50VSX, 50VW, 70VS-After, 80VSW, GLD20, GLD20ii, GLD30, GLD30ii, GLD50ii
The above reels can use the 25-50VISSP Handle Knob kit