Yes. They're morbidly afraid of dirt and fall off.
(I'm exaggerating, but whilst they are made of quite strong material, they have a design flaw - theres insufficient material strength around the bolt holes. If they get rubbed on a bank, which happens, because they're wide and quite rigid) the bolt heads pull through the flares and they fall off, often getting wrecked in the process.
Defender flares:

search for Blakey in the rigs section.
Can't really help for resellers, best to search or try the aulro forum maybe.