gsf do 2 types of pulley £46+vat or £76+vat i am doing my pulley at the moment as it came apart and cut into timing belt more £££££ i had a look at the pulleys at gsf the cheaper one is crap it a patten one the other one is genuine and looks and feels like a proper bit of kit the thing that gets me is the cheaper one comes with 12mounth warranty and the other only 6 mouth