To be honest, I know they can be a bit of a moisture trap, but on the Scirocco I fitted some 3m clear protective vinyl where the mudflaps touched the paintwork, and take them off every 3 months or so for a good clean and seal behind, and so far no issues at all. All looking brand new.
TBH, if they aren't available it's no big thing, as I'm sure I'll be so made up with the car, I won't notice one bit !!