More than everything you wanted to know about Ford's Easy Fuel™ “no cap” Fuel Filler
http://www.motorcraftservice.com/vdirs/retail/Easy Fuel.pdf
The fuel filler (white) funnel part number is 8U5Z-17B068-B. List price is $8.15 and cost from Itasca is $5.38 plus shipping.
Welcome back Dan.
Figure #6 in the PDF made me chuckle a bit.