hi all because off the poxy snow we have been having my rear wiper spring has snapped dont know why maybe because of the cold or because i put the wiper on when it was still frozen but anyhow the spring has snapped and doesnt really clear the rear window anymore so can i get a new spring from audi or is it a complete new arm from audi i was also thinking of updating it to the aero wiper as a few people have done on here is that worth thinking of doing