[DeTomaso] taillight screw question

[Panteratime]

 Folks--
Awhile ago you recommended the replacement screw for the 72 taillights was a .7 pitch .04 metric machine screw.  Of course you all were correct!  Got some nice stainless screws with the allen head at a local ACE store.   When I went to remove the second lights screws, passanger side, there were coarse thread, philips pan head screws on this light--all four.  So one side had metric phillips .7 pitch pan head and the other had pan head, coarse thread phillips sheetmetal screws.   Also-the metric screws are a hair too large to fit in the lens hole.  I also think since course thread sheetmetal screw was in there, the receiving whole will not thread the .7 pitch metric machine screw.  
Has anyone had this on their car? suggestions?  Thanks