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There's nothing wrong with fixing what isn't right, but don't get hung up on making it airtight. There are plenty of other places for engine-bay air to come wafting into the cabin. The cabin area is not "sealed", those grommets are there primarily to protect wiring and hoses passing through the firewall. The seal they provide is secondary to their function and is a convenience. Once you get the heater running, you'll be sucking in the exhaust that's leaking up the firewall anyway!
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Current stable:
1995 E320 157K (Nancy)
1983 500SL 125K (SLoL)
Gone but not forgotten:
1986 300SDL (RIP)
1991 350SD
1991 560SEL
1990 560SEL
1986 500SEL Euro (Rusted to nothing at 47K!)
Gone and wanting to forget:
1985 524TD 167K (TotalDumpster™) [Definitely NOT a Benz]
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