I just wanted to share with other, who have been looking that I found a vendor who has the correct locking screws for my metal Louvers. The vendor is Southco and the screw is Southco Material D4-FJ5-40SSNA
DZUS STD Line, Stud
My contact there is Anita Brown-610-459-4000
I have been searching for a few years, so I'm glad I finally found the screw replacement, the screws are silver not black, so I'll have to spray them black and add a washer, but other than that, I at least now have screws to lock down my Louvers...hope this info helps others. There is also a D4-AJ5-45ZCTNA that is a bit longer, but would also work with a spacer.