Original back box thoughtfully put in the boot by the PO very much less 'in yer face', almost looking lost. Noticeably quieter as well, gone has the 'rort' on mid-range acceleration, which is no loss as far as I'm concerned:
Near-pristine rear section of the POs box ...
... but for the heavily corroded flange:
Halfords 'off the shelf' hanger noticeably bigger comparing faces, and a lot thicker:
eBay alternative strengthened with a cable tie:
June 2019: Halford's replacement a bit shorter than the original:
Looking inside you can see the original 'chiselled' end with a trim-piece bolted on!: