W126 Headlight Bulb Replacement?

I know there are a few merc owners on here so I figure it's worth a shot asking. Does anyone know how to remove the rear cover on the headlamp housing to replace the bulb? I've read that they're 9004 bulbs, but Advance Auto says they're a sealed beam bulb and I essentially have to replace the entire housing. I found a forum post saying there are clips to remove the rear cover but I'm not seeing it

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