Can it be that Chrysler back in the day had more then one supplier? I have only found SEMA bolts but those C bolts looks spot on except the SEMA text on the head.
I bet they did have more than one supplier for the bolts as we have seen on other parts! The bolts in the bag are the “C” style which came with a set of chrome 65 valve covers I bought. The 6 bolts with the “C” I remembered is for a slant aluminum vakve cover. I knew I needed bolts for my Commando valve covers and sure enough they were in my storage and they are marked with the SEMA on the head!