Business must be too good for sb tactical - SB Tactical MPX Pistol Stabilizing Brace for SIG SAUER SIG MPX and SIG MCX

Waited 3 weeks to receive this brace. I ordered the brace for the SIG MPX. I received the brace, however the install instructions were for everything BUT the SIG MPX. NO set screws applicable wrenches were included. the set screw on the MPX will not work on the SB Tactical brace. How is a customer suppose to know size and length of screws needed ? Really disappointed. Just because they were backlogged, is NO excuse to forget the little things.