I mean the top ones. I went to VW and they said they were M10's, got some M10's and they dont fit!
If I am picking you up correctly, you are meaning that you bought some new M10 nuts - but not from a VAG dealer, what has happened there is that VAG, and others, tend to use metric fine threads and/or extra coarse ones, depending on the "size" and application. The normal run-of-the-mill bolts and nuts that you can get your hands onto easily tend to come with only what is considered "standard" threads - I've been there done that - but I only had trouble with cleaning up external threads mainly so bought a big but cheap tap and die set from Screwfix as it covered most of these fine sizes. Originally I supidly just aquired some M6 or M8 or M10 nuts - but quickly changed my ways - get the right ones from VAG. On the other hand, the parts lists tend to accurately describe the thread - I think. And yes as said M10 is a nut or bolt thread size, 10mm is the spanner size - ie 10mm across the flats, from memory 13mm could be the spanner size for either M8 or M10 - can't remember which - but that assumes that the nut is not a nyloc nut , just a plain nut.
