The bane of parts off two aircraft not having holes line up..Cant use a piece of Aluminium rod and countersink the bracket both sides and peen into place?Then sand smooth.I use soft A rivets to plug unwanted holes.
Its 5 minutes to learn how to use an EWheel,the rest of your life to Master it..Plenty of stuff on youtube..Lazze is my best start with anything sheetmetal...
Lazze sheetmetal