No, the steel the runs under the seat box, the ally 'sill' bolts to it. Attaches at the bulkhead and the out riggers I think.
The rear on a 110 csw is all one thing with the door pillars and everything, but only the bottom section is rotten so just want to chop a new piece in.
This is for someone else, as soon as my pay comes in I'm having some rock sliders on mine, got bloody chequer plate at the mo... Not a fan!