For all interested, I called AMP Research today and spoke at length with a guy there that I met at SEMA, Las Vegas.
The OEM door is cast aluminum, not metal. It is not CNC machined like the SMA door because GM will not pay for CNC'd parts. He claims that from the outside, you will not tell the difference. The open door is not as pretty because you will see casting marks--GM will not pay to clean that up either.
I have the origional SMA chrome fuel door and will order the OEM one from Hummer-partss.com. Then I will put them side by side and see if the guy is right.
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