Light bulbs for tail/brake lights for my 91 129

I have a couple of tail/brake light bulbs that are burned out on my 1991 129. I went to the parts house yesterday to buy new bulbls but none of the bulbs fit the sockets in my tail/brake light brackets. Are these bulbs proprietary? Are they avaialbe from another source other than the local Mercedes Benz dealer? Thank you

I have a couple of tail/brake light bulbs that are burned out on my 1991 129. I went to the parts house yesterday to buy new bulbls but none of the bulbs fit the sockets in my tail/brake light brackets. Are these bulbs proprietary? Are they avaialbe from another source other than the local Mercedes Benz dealer?
Thank you

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