A lot of the later model 90 hp supercubs I maintain have the flap brackets, higher gross weight tubes and double groove trim. Most of the early 105’s...
Unfortunately it is not just the wings that need to be modified. You must weld in the brackets to hold pulleys, cable guides, flap handle attachment...
I am looking at a Tango Cub with out flaps ,Can you add flaps to non flap wings ? Or do you need to buy wings with flaps ? Or is this even feasible ....