Pole Positions will be much lighter than stock seats but you may have to replace OE seat runners and more likely fit new seat belt buckles (receivers). Recaro seat cushion/base has high side section and OE buckle will not sit comfortably so most commonly webbing type is used instead of cable/rigid type. Not sure about the runners cost (anything Recaro is pricey) but belts buckles can be made to measure and they are quite cheap to replace. Let me know if you will need more info
Pole Positions will be much lighter than stock seats but you may have to replace OE seat runners and more likely fit new seat belt buckles (receivers). Recaro seat cushion/base has high side section and OE buckle will not sit comfortably so most commonly webbing type is used instead of cable/rigid type. Not sure about the runners cost (anything Recaro is pricey) but belts buckles can be made to measure and they are quite cheap to replace. Let me know if you will need more info