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I need new spark plugs and all my research tells me these are the right ones, but for some reason the site says they don't fit? Are they the correct ones? 2019 GLC 300
Your MB sparkplugs are probably re-branded Bosch. Go to boschsparkplugs.net and enter your vehicle info to see which Bosch plug(s) fits. If you really want MB branded plugs, then go to one of the online parts distributors such as autohausaz and enter the Bosch plug number and see what other plugs are listed as compatible.
I have found searching directly for MB parts by vehicle on distributor sites to be notoriously inaccurate. Parts listed as fitting don't fit and parts listed as not fitting do fit.
Your MB sparkplugs are probably re-branded Bosch. Go to boschsparkplugs.net and enter your vehicle info to see which Bosch plug(s) fits. If you really want MB branded plugs, then go to one of the online parts distributors such as autohausaz and enter the Bosch plug number and see what other plugs are listed as compatible.
I have found searching directly for MB parts by vehicle on distributor sites to be notoriously inaccurate. Parts listed as fitting don't fit and parts listed as not fitting do fit.