I would say the r-b-w bolts with the target were used...
..the anchors were typically used by AOSmith and are usually black phosphated. They hold hoods and decklids on the hinges
The other common bolt looks like the one above, but an “s” replaces the four dots (first post)
Every Ford bolt has a unique number. This bolt is numbered 378178. You can identify which bolt you need by looking at the Ford assembly line manuals. This bolt is commonly used to mount front fenders.
A part number suffix is added to identify the finish on the bolt. The bolt on the left is 378178-S7 . The "S7" identifies the silver finish. This bolt tends to be on later built cars. The bolt in the center has the same part number, but a different head design. This design is more common on early built 1968 Shelbys.
The last bolt is a 378178-S2 . AO Smith used the black oxide version of this bolt to mount hoods and rear decklids to the hinges on 1968 Shelbys. It has a small anchor as a design.