I deal with LeeValley all the time. I might switch to them even if they are not stainless. Ordering small items as such from the States can double the cost.You can check with Lee Valley. I use the threaded insert that they carry and find them excellent installing bolts on necks ....you use an allen wrench to install them and they also carry the matching bolts which is also installed with an allen wrench....Hope this helps..... Lab
Have you ever had any break on you while installing them? I'd hate to try and dig a broken one out of a 500 dollar neck.http://www.spaenaur.com/view_pdf.asp?Page=B70
Spae Naur in Kitchener is a large fastener supplier - I buy a few items for my woodworking business from them. They used to have a $50 minimum for shipping though, but they also have a walk in sales desk if you are close buy.