Had my second breakdown in two years last weekend. Alternator pulley wheel nut came undone, fan belt came off and stuck behind crank wheel. Stupidly it was my spare (gsf sent the wrong type)so I had to suffer the humiliation of calling the AA for a fan belt!! I was so embarrassed. Anyway, noticed my pulley wheel was badly burred so i'm replacing. Gsf do a genuine one for 21.50 but jk say they do an oem one for 8 and say it is a quality part. As it's rather vital has anyone used the jk one and is it any good?