taco eater :
trickMETRIC from Grand Rapids, MI United States
To use these shoes with your old Puch Hammer/Jammer, swap out your old hub for this one -https://www.treatland.tv/treatmetric-puch-e50-jammer-clutch-REPLACEMENT-H-p/jammer-clutch-hub-6.4.htm
You can also use these in Garelli Hammer v2.0 clutches, and in a pinch, Garelli Hammer v1.0 clutches.