Replace waste fittings on Franke kitchen sink

I have a Franke 1.5-bowl stainless-steel kitchen sink. The hollow central fixing screw/bolt in the main bowl waste assembly has corroded and broken. I would like the complete waste assemblies for both bowls replaced, including the fittings, seals and main-bowl overflow as required — not just the removable strainers. Photos are attached. The offer is for job only; I will pay separately for all required parts/materials.