One of the tank tabs that secures the side panel was broken when I got my Attak many years ago.
I acquired a round head 1 1/2"x 1/4" Stainless Steel machine screw, drilled a 1/4" hole in tank cover where tab was[there is a mark on outside of tank cover to guide you].
I inserted the screw with a 1/4" washer under the head, 1/4" washer on inside of tank, then a nyloc ss nut, snugged it up, left a gap then put another SS nyloc bolt on the end of the screw. Side panel tab now nicely hooks on to the screw between the nyloc nuts.
This set up has worked better then the factory tank tab for many years now.[the machine screw might be 1 1/4"can't remember exactly]
Works for me