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nope, cant buy just the screen. I work for GM, I tried. FWIW, I have 438rwhp and I still have a SCREENED MAF sensor. Dont descreen it, it flows just fine and its required for the correct readings.
You may try a post in the Parts Wanted forum, maybe someone has a set lying around. Otherwise, you could probably snag a used MAF off the boards for 50 bucks.