When I bought my 57, the grill bar was cracked and the emblem broke. Didn't think nothing of it because someone obviously had a little accident along the way as it had a silver grill and no louvers in the fenders, and it's a true belair. So, bought a gold belair grill and bar from a local guy that was almost new. Installed no problems, but now I've noticed a small hair line crack starting from the top corner near the emblem of the bar. The crack could've been there when I bought it, but I think I would've caught it earlier. What could be causing that? I don't slam the hood closed and I really haven't driven it much since installing the bar?