Question: How to change bulb in 1968 side marker lights

Hi All,

My first time posting here, I have the following question:

I have a 1968 dodge dart, my rear side marker lights work, but my front fender ones do not. I can remove the housing from the fender, but how do you open the unit to access and change the bulb? Does it twist? Is it pressed, is there a tool for removal?

Thank you for your help.

sjralph