On my 70 Barracuda, When I removed the SS molding around the windshield I noticed the wiper arm had scraped large scratches in the molding. The windshield is badley scratched also. I noticed the wiper arms were bent. Are the arms supposed to be straight? I think the previous owner bent them since the arm was scraping the windshield. I think the arms were also bent because the aftermarket wipers made out plastic have a lot of slop and cause the wiper arm to scrape the windshield. Thanks