Screw code

["B&C Phillips" <bjcap@frontiernet.net>]

Looking for an interpretaion of screw code MTZ 604. According to the factory 
parts manual (BJ8) they are for the rear trim rail that holds the hood 
(convert top) to the body. There are 10 of these.
Also, manual states the upper trim rail is fastened with rivets ( 8 for BJ8) 
I have two cars that were fastened with slot pan heads and also the rear 
trim rail.
Question is, could that be correct knowing anything  is possible?
Thanks
Carroll Phillips