The sketch on the right is all I have. There is a b/w ww2 photo but can't get it in good quality.

The Wk358LP got tested in the early 1940's but the stickgrenade body appeared to be too heavy.
Even a more powerful propelling charge wouldn't help. Production numbers are unknown.
It seems that the grenade body was attached to the stick by a metal adapter, like on the picture below.
An observation by Dimitar.

I have three versions of a stickgrenade-adapter pictured HERE, but I don't know much about them.