if thats those nasty plastic ones with a metal thread (left hand thread as well ithink) you may struggle to get them anywhere else, you used to be able to get nut only from alex at gardiners but dont think they use those clamps on their poles anymore so spares will be scarce,i tried lots of bolt factors and no luck not bought a pole with that style of clamp since 3 years ago and those nuts were the main reason