Steve,
NPD is a distributor of selected AMK products. The key is selected, not all. Any of the concours attaching hardware listed in the NPD catalog are AMK products. My guess is you are in need of less common attaching hardware pieces. If this is the case you will most likely have to order straight from AMK (minimum $15.00 order).
The major parts suppliers are only going to carry what sells, not every item in a product line. That's just good business. Sorry.
Why don't you post what you need. Including myself, there may be a few VMFers who might have what you need or be willing to share in an minimum $15.00 AMK order.
Regards,