If you bought this it's likely that all you would need would be the Porsche bracket - and given that you are intending on fitting this to a GT3 style bucket you might be able to make this bracket work for you: https://www.ebay.de/itm/FEUERLOSCHE...s-Benz&hash=item5d7c9c157b:g:1xkAAOSwbLZa0efc
Personally I'd get a fresh extinguisher, also.
Personally I'd get a fresh extinguisher, also.