Some grill Hardware Questions

[john108]

1968 Charger.  When I removed the grill, a long, long time ago, I didn't know what I was doing and removed bolts that I didn't have to.  
Later, on this site, I had help find the hidden bolts. Now I don't know what any of those bolts look like.

The first picture shows the 3 piece plastic portion of the grill.  The second picture shows 1 of the 12 (5 top & 7 bottom) U-nuts that I believe interface the attachment points for the 3 plastic grill sections to the metal portion of the grill.  There are about 10 other U-nuts on the plastic pieces and that is where the loose bolt shown comes from. That bolt doesn't quite fit the 12 U-nuts referenced.  Could be some rust?

What does the original bolt look like for those 12 interface U-nuts? Their size and length if available.  
I believe that the 12 interface locations are where two-piece plastic washers snap together on each side of the metal grill section.

The third picture just shows the location of one of the U-nuts.
I know that this is very wordy for a simple question!
Thank you for reading it.

[BrugeeRT]

Not sure of the thread count and width but they are about an inch long.

[gtx6970]

All the grille hardware is 10-24 machine thread

EXCEPT,,,,,,, the hardware that mounts the frame to the body. Those are 1/24-20

[john108]

Thankyou.
10-24 Good to know.
I bought some new 10-24 U-nuts because I couldn't get bolts to screw all the way in to the ones I have.  A tap may have cleaned them up, but they are somewhat rusty.

It is also good to know that all the bolts have HEX heads, and appear to have a pilot.
What supplier had that kit and what is it called? Various parts of the grill goes by a different name.

[BrugeeRT]

Front grill hardware kit.  Classic industries has it.

https://www.classicindustries.com/product/mn3086.html

[john108]

Thank You