i found that! but that prob because you were speaking to people that didnt know what they were on about tbh! i think if you use the term CAP BOLTS ind strengh 12.9 that should make a few think! rather worrying then these people work in fixings and fasternings companys! they will do the job! and you can use the existing nuts! (they have a washer already included) iirc i used a washer on top thought great look forward to pics!!!!!!!! dont over tighten as there not the best of nuts (a bit soft) and 12.9 is a bit over kill tbh but better be safe then sorry!!