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.
I think the redistribution costs of such an order would outweigh the utility of reaching the minimum order. Besides, by the time I organized people enough to get their orders and their money, and took the time to repackage and remail everything, my patience would have reached an end!
Just wondering about all the mentions of going to NPD to save on shipping costs. They have a minimum $6.50 shipping charge (if order is over $300.00 they ship free but not all items qualify for this). I've dealt with NPD a number of times and usually try to wait till the bill will be $65.00 or more (I live in NY State and over $65.00, the shipping cost is 10% of the order). I feel your pain with a small order (having to pay as much for shipping as for the part you need). I've had to make "small quantity (low bucks) purchases from NPD and they never budged on the shipping charge.