85 300SD Depo lights- Bulb replacement

[Beastie]

Okay, I bought and installed a used set of the Depo Euro lights on the SD almost 2 years ago. Love the look but more importantly they perform so much better than US spec lights IMHO. Anyway Driving home the other evening just after dusk it seemed a bulb was out. The high beams and fogs all work but the passenger side low beam was out. I checked the fuse box and cleaned the contacts for that lights fuse ( I will still replace since it is the aluminum type) and still no light. I pulled the bulb and it looks okay not burnt and the filaments look okay ( I need a magnifying glass to make sure ) Anyway I could not find them for sale here on Pelican any thoughts on where to buy ? Also since I do not have all my shop manuals ( in storage ) available does the high beam use a different relay ? Meaning should I check the low beam relay ? Also the P/N # etc on around the ring of the bulb base is really worn / faded and hard to read at all.
I think I can make out "OSRAM" ( sylvania ) but not the wattage. I believe it says 55/65 ( one bulb for high and low ) Thoughts ? I do not want to buy a pricey bulb if not necessary. I do have a pair of bulbs for the uninstalled euro lights for my 500E but again in storage.