The S6-65 is a ZF product, used ~2 decades ago in Ford and GM pickups and other applications. ZF has a downloadable catalog of all its products.
Perhaps if you were to use Google a bit, you might find something using the actual MB designations: G56 & G85.
Edit: the versions of the ZF S6-65 used in American light trucks have different gear ratios than the version(s) in the ZF catalog. In my catalog the S6-650 is superseded by the S6-700. But all have overdrive 6th gear.
