I believe that I was the person who mentioned 5/8" needles. Stuart Mott, a nurse who specialises in best practise for cannulation (a lot of the Fistula First best pracise has come from him) told me that these would be best for me as my fistula is shallow. My nurses didn't know about these, and Stuart sent me some (I met him at a NxStage conference). My nurse was anxious about using them because they look so short, but he has since used short needles on another patient. These needles are made by medisystems, which is a NxStage Company. See link:
http://www.medisystems.com/Hope this helps you get your short needles.