When I say flat as opposed to the original I mean the original ones have a raised lip around the perimeter, so when you pull it into place with the screws, it puts pressure on the outer edge and fits tight.
The aftermarket ones, lacking that, just don't get as tight a fit. I've actually removed material creating that hollow to try to get them to pull in tighter.
I can't post pictures here but I'll send one to your email.
But you're right, heating can help get the correct curvature.
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