John, I had the same problem as you with Austin Hardware website when I ordered my hinges. I finally gave up and simply called the 800 number at the top of their web page. I got a very polite and helpful person who took my order and the hinges were delivered to me 2 days later via UPS.
Also, I suggest you ask them to include a copy of their catalog with your shipment (as I did). Everything in the catalog has pictures and specifications included in it - a lot of fun to browse.