[Mike K]

I looked at the horn button assembly on my C8.

I am 99% confident the screws are original factory fitted .... but who knows I can't be too certain ?

My hunch was correct, the screws are C/sunk head with a domed top, not flat. The pressed metal ring has holes that are shaped to accept the C/sunk shape.

Those round head screws in Jordan's NOS GMC kit look to be too short for a moulded GM CMP steering wheel plus the round head shape, just doesn't seem they would fit the pressed ring correctly.