With the Prototypes of the Upgrades for the 251 in mind, are there any of those that might fit on the 250?
(like the mortar & the stummel - at least for the late version)
Edit
and if not maybe the might be combinded for both if few changes are needed (as in extra parts)
Here is a cross-reference which of these variant components can be used on the SdKfz 250:
251/1 with sPzB 41 - C & D and 250/11
251/2 Mortar Carrier - C & D and 250/7
251/10 with 3.7cm PaK 36 - C & D and 250/10
There are also plans to do SdKfz 250 ONLY variants... but not until we have the basic kit released.
NOTE: There are no release date!