I would imagine that there are plenty of us NA Corrado owners who are looking for something like this. I haven't found anything from anywhere about changing out wiper arms on the NA version of the Corrado. I owned a '90 G60 from 1996-early 2011. I did the grinding of the stops and bending the wiper arm to get it to work. After a year and a half without a Corrado, I had to get back into one. I just traded in a Mercedes E320 for another 1990 Corrado (this one has had a VR6 swap) and couldn't be happier, but the wipers on it are garbage. I can't tell if the previous owner ground down the stops or not...but if I can't tell, that probably means he didn't. I've been researching this for the last 5 or 6 hours. The part numbers listed on this thread appear to be for right-hand-drive Corrados, so they're not going to work for the North America Corrado (left-hand-drive)...the bend in the arm is going to be the opposite direction. From what I can tell, the product number for the North American Mark 1 TT Wiper Arms is 8N1 955 407A, and the wiper blades is 3A1 955 425. I'm not entirely positive on these numbers or if they'll work on a Corrado, though, so don't hold me to it...just putting it here for reference and for any other NA Corrado owners looking to go this route. The dealer wants $109 per arm and $16.50 per blade...so $251 USD total (plus sales tax). I don't have that kind of money at the moment (after having to fix so many other things on the Corrado that sat untouched for 4 years...fuel pump, water pump, power steering pump, A/C compressor radiator, radiator fans, headlight relay harnes [at least it had the e-code lights already], stereo, speakers, door lock actuators, thermostat housing and all temperature sensors).
When I am able to try out the NA Mk1 TT wiper arms on the NA Corrado, I'll report back with the findings.