Hey man I am converting my SS to a Supra like you did. But how did you get the aluminum bracket to contour the drum shell for the butt plate? And mine is a 60s so I dont know if it is different than yours,but I dont have 3 screws holes on the throw side.Unless you used the hole for where the throw lever goes into the shell. Mine has a rod that goes from one side of the drum to the other for the throw lever. Did you used that hole?