Join Date: Nov 2013
My Motorhome: Chausson Flash 22
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You say you have searched everywhere, but where exactly?
Have you tried Renault Commercial UK, Renault owners Club, Gumtree, E-Bay, Renault Commercial France, Partco or any good gearbox component supplier?
By gearbox mount, I assume you mean the rubber mount which attaches gearbox to chassis?
In my experience the brand owners club is usually a very good source of info, so Renault Owners Club might be your best bet.