Hi Mark,
typically one or more sources can be found in the "Marktplatz" section or around the bay:
armrests / inner doorhandles Before quickly replacing the handles, check twice if they're actually faulty. Serious amounts of dirt and stain can be removed using oven cleaner or the orange-oil stuff professional refurbishers make use of. If the clamp wouldn't "bite" any more, take an allen wrench and turn in and out the clamp mechanism on the removed handle checking if the thread is in it's place and working.
Cheers
Flo
