Looking for someone knowledgeable/experienced in replacing the glass on a 328. Caught a rock chip in my 86 Euro glass. Specifically trying to determine if there's an actual difference in curvature/fit between the standard and curved glass. Have sourced replacements (yes, two) through a parts supplier to remain unnamed at this point pending their ultimate handling of the problem; we've discovered, after two of the 'standard' curved glasses specified by the vendor haven't fit properly, there's an "extra curved" windshield (with the same part # as the 'standard' curve, but with "extra curve" at the end). This extra curved glass is about $1,000 more than the standard glass, so about $3k to 2k, respectively. Thanks.