Glass door back to back fixing kit for 20-25mm diameter pull handles - Satin stainless steel
Fab & Fix Rear Pull Bar Handle Fixing Kit | Push & Pull Handles | Screwfix.com
Mila Supa Back-To-Back Fixing Kits, For The Supa Pull Handles - 573310 from Door Handle Company
M8 Pull Handle Ornate Fixing Pack - SBF1022SSS at Simply Door Handles
Mila Supa Through Fixing Kits, For The Supa Pull Handles, Polished Stainless Steel, Satin Stainless Steel OR Polished Gold - 573302 from Door Handle Company
More Handles Blog - Pull Handle Back-to-Back Fixings - Fitting Guide