Wow Frank, that is cheap.
I think, however, that your diagram is from a later RD. Mine (1953) does not have those two posts (carrying handle) cast with the Adapter (using terminology from diagram). The carrying handles on mine are threaded and screw into the adapter, knurled on the outside and the end has a hole drilled through it.
I guess the other explanation could be that mine is a military motor (RDM) and they made the carrying handles for them differently??