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Two places I know of that you can get them. One is John's F-Fun Hundred, http://www.johnsf100.com/ part # 33__L)__427403-A, 25 cents each. These have the star washer but have a flat phillips head. The other place is a private person on the Bonus Built site who had some made up, check out their post at: http://bonusbuilt.com/forum/viewtopic.php?t=893 I don't want to put up their email address here. These have the domed head, about 35 cents each.
I bought SS button head from McMaster-Carr and polished them. About the most economical route I could find. They have an extensive inventory of all types of fasteners.
I just received the ones from John's F100 that bobj49f2 mentioned. They were $9.25 total with shipping (I think I bought one extra screw at 25 cents a pop). Going by my magnet test, the screws are stainless, but the cone star washers are not.
Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath
Slideshow: Called the Fortress, the 850-horsepower pickup combines Raptor underpinnings with military-inspired features, survival equipment, and a starting price of $285,000.