You will find them on page 6 of their catalog. You can download the catalog at
www.batinc.net They show the caliper springs (2)- E0 only as part number K420K7A for $12.50. They do not have a method of ordering parts over the web or by e-mail, so you will need to call or fax the order. (941) 355-0005 fax (941) 355-4683.
Don't be upset with the poor guy at the dealer's parts counter. He is only as good as the Ford parts system. It isn't his fault. Fortunately BAT recognizes they Ford shortfall and can supply the retaining spring clips.
