Need Help identifying these Bumper Bolts

[Ron42Dodge]

I have 3 styles of Bumper Bolts that seem a little unique.

 

First I have a triangular shaped capped bolt.  The triangle is roughly 1 3/4" tall (from middle of short side to opposite tip) with the 2 sides being almost the same as the height and the short side being 1 1/8" across.  Appears to be 7/16" to outside of threads with the length of 1 5/8" measured from the back edge of the triangular shape.  The threaded portion is 7/8" with 14 thread per inch (coarse thread).

 

Second I have a Round capped head that has a curve to the back side.  The head is 1" in diameter.  Appears to be 7/16" to outside of threads with the length of 1 3/8" measured from the back edge of the head at its longest point.  The threaded portion is 1" with 14 thread per inch (coarse thread).

 

Third I have an oval shape capped head. The oval is 3/4" wide and 1 1/4" tall.  Appears to be 7/16" to outside of threads with the length of 13/16" measured from the back edge of the head.  The threaded porti is 5/8" with 14 thread per inch (coarse thread).

 

Any help in identifying these would be appreciated.

[Carolina Chevrolet]

I think the last picture, the oval headed bolts, were used by Plymouth, late 30's- late 40's. 

[Ron42Dodge]

I figured out the triangular ones.  Apparently used on 1935 -38 Plymouth Rear Bumpers and called a Shield Shape.

[41 Su8]

The 3rd picture resembles 41 and 42 Packard.