replacing rear quater panels

Hi There, just in the process of replacing the rear panel on my tub (1971 88) as the other had rotted through and broken off but wasn't sure whether these just bolt straight to the rear bumper fixings or is there a bracket or spacer that attaches?
Unfortunately I took this apart last year and seem to be missing a few bits!

Also is there a parts diagram on line for the rear tub as that would be helpful

Do a web search for smithies landrover NZ site of interest with pdf's of manuals

Thanks, can view the site from work computer but won't let me download due to fire wall so will have to do that tonight when I'm home.
Only problem is I wanted to order any parts I need today so if anyone knows whether there are brackets that would be great. I know YRM do the support between the rear of the floor and the bumper but not seen anything else.

This piece https://yrmit.co.uk/product/rear-tub-underside-corner-stiffener-land-rover-defender-series-2-3/

Thanks Blackburn