This transmission was originally designed for the W108 and W109, but was also found in the W123, W114/115, W111, and r107. It is very rare to find one in the United States as most of the US marketed cars of that are era came with automatic transmissions. This particular one, including shifting rods and shift controller were sourced from Europe.
For anyone interested in a conversion or a swap for their car, please see ebay listing for pictures and details by searching “Mercedes G76 5-speed manual transmission “