Petzl makes great crampons but after time and use you may need to replace a part. You could also upgrade other crampons with these binding parts. All parts are sold in pairs.
LeverLock Back Levers - Rear throws that will fit Leopard and Irvis Hybrid crampons. Includes long straps to feed through semi-auto toe bails.
LeverLock Elastic Straps - Elasticized keeper strap for heel throws on the Leopard or Irvis Hybrid automatic crampons.