Springfield Armory Store has the correct screws, part number HC6070. You get 2 screws (7.5mm, allen) and the allen wrench- $4.99 as of today, with FREE shipping. I want to point out one thing-- if you look closely at the picture on their site, these are 10.9 load rated-- VERY important! That 10.9 rating is the 2nd highest rating in the metric system If you decide to go out on your own, you might want to respect that rating-- el cheapo screws will bite you, and possibly your weapon. And, yes, I have this kit on my Hellcat, shooting 147 +P, with no problems whatsoever. I did install with blue loctite, but YMMV. The RMSc I installed came with 8mm screws, but they exceeded the install specs in the Hellcat manual, which says screws should protrude only .094" below the bottom of the site. The 8mm go about double that...
Hope this adds a little. Yes, I'm a newbie-- hope that isn't held against me!