see if you can find a trim shop near you or a place that installs convertible tops.
you can get some #8 Phillips with a smaller oval head.. umm #6 I think and a # 10 screw with a # 8 head for those flush type applications. I'm redoing mine and talked to the guy I'm learning trimming from (gonna get a deal on installing my new top.. free is good right?:)) He has a selection of those that I was able to fit to my A pillar.
truthfully OLD ones are better if you can get them since the new # 8's and #10's are slightly smaller than the old ones, somewhere in the .002-.003 range. I will have to slide a piece of wire brush bristle into one of my trim holes to "adjust" the hole size on one of my parts using the newer screws in a well used screw hole since I ran out of the older ones.