The Winter Storm 250/10

[zaarin7]

From "Encyclopedia of German Tanks of World War Two":

SdKfz 10/4 had an armored cab/engine but no date.
SdKfz 10/5 had one as you mentioned.
SdKfz 7/1, 7/2 had one late 1943.
SdKfz 6/2 not mentioned or pictured as having one.

I guess the ultimate solution is prior to 9 or 10/43 treat all these vehicles as un-armored targets.