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how curved is that area? those grommets are pretty cool. id say cut it with a holesaw put the grommet in and just bang it into place and screw it in with the supplied holes. If its not going to be seen you can squirt a little seam seal around it to ensure its air tight... the ring around the seal is metal right?
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97 Firebird Formula - 383LT1
15 Subaru WRX - 2.0L-turbo
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