These are Four Ashes design of exhaust rear hanging bracket (non original style) in Stainless Steel for twin exhaust system. these brackets clamp on to the tailpipe which was welded together to the Burgess original silencer box, modern boxes sometimes use clamps to fix the tailpipe in to the silencer, this bracket is then bolted to the rubber sling, using the AML tube & clamp plate system.

2 per car, designed for original sized tube of 2"or 50.8mm, or some manufacturers sliencer tube of 54mm but can be made smaller / larger or ?, comes with a Stainless 1/4" bsf bolt, stainless nut, 2 flat washers & 1 spring washer

 they now come polished on the outside as in the 1st photo showing a pair of brackets

last photo is where it fits, its off a system that was fitted over 30 years ago so doesn't use the rubber sling