Mounting Screw Sizing for a Well Mb01 Trigger Box

[Squiggout]

Currently trying to upgrade my Well MB01 that I haven’t used in years do to a broken trigger box. My 13 year old self didn’t understand the concept of slam firing, plus the detrimental affects that it causes. So when ordering a new trigger box I figured it would come with screws, clearly it did not. The mounting screws for my old broken trigger box are long gone. Does anyone happen to know the sizing for these screws? If not, could another owner of an MB01 size their own? To clarify, these screws attach the trigger box to the upper receiver where the bolt slides in and out. Any help is extremely appreciated.