Just curious, you are asking about the 123 chassis, yet your signature line says you own a 300 SD. That would be either a W116 chassis or W126 chassis. Neither one of the those has round fog lights.
The amber fog lights for the 123 were glass Bosch lamps with replaceable light bulbs form behind, H3 I believe.

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1999 MB SL500 (110,000 mi)
2004 Volvo V70 2.5T (220,000 mi)
2014 Tesla Model S 85 (136,000 mi)
MBCA member