Carrier gas burners should always be replaced as a set. Common conditions we see are holes rusting in the burner or the nozzles being plugged with rust. Sometimes there are 2 different burners required for a particular Carrier gas furnace. One burner may have some type of adaption for a pilot or may be designated as an end or middle burner.
If you are unsure of the correct gas burner for your application please give us a call or send an email with your gas furnace product number. We will make sure you get the correct part so your repair will operate as designed from the factory with no safety worries.