I assume your working on the MB in your signature. Not quite sure but if its like my W124 Just tug on the headlight switch it will pop off revealing a largebolt that shouldn't be overly tight. I used a pair of needle nose pliers to pull the bolt. Once that is removed it should come free if memory serves me correctly. The bulb in question should then be visible which is a #74 bulb. Only few parts houses stock these bulbs. You may need to pick one up at the local MB dealership if you have one, should set you back about $2.50. Let me know how it turns out!
1957 Dodge D100
1967 VW Microbus 21 Window
2004 Beach cruiser bicycle
"It cannot be emphasized too strongly or too often that this great nation was founded not by religionists, but by Christians; not on religion, but on the Gospel of Jesus Christ. For that reason alone, people of other faiths have been afforded freedom of worship here." Patrick Henry 1776