If you go to the 'Buy Parts' link above you can buy the OEM Bosch HVAC filter for the w124 (and other vehicles). If you're looking for the distributor, see the link above and give Phil a call, he will probably be able to help you with that.

EDIT - just noticed you're referring to pre-94 air filters. The pre-94 W124 did not have HVAC filters and the techs here indicate the blower motor on those models isn't sufficient to support the added airflow resistance of having an after market filter in place (i.e. the motor will burn out after awhile).

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Daily Driver: 02 E430 4MATIC
In the family: '03 E500 // '04 ML500 // 64 220SE