Not only is there no base frame, it is also no longer sold or only in remnants. According to the EU directive, it has been forbidden for 1.5 years to use belt grinders stationary, which is why the "new" models of the PBS 75 AE are also produced without the threaded holes needed for mounting on the underframe.

Unfortunately, this is not true. There is no underframe! Only the parallel and angle stop...
In addition, it has a Schuko plug and no adapter, so unfortunately the description is only moderately correct :-((

Hello. The name here is not really good. It is the PBS AE 75 set.
"Can be used stationary - simple attachment through clamping possibility in the base frame, with parallel and angle stop, e.g. for bevelling workpieces."