Regarding the Crusader TDs...
First off, i already told that their initial number is unknown, sadly the same thing can be said about a lot of aspects regarding their service, deployment, retirement..etc. So ill go around what i got about them (each individual version and a bit of info)
Much like every other projects of this class, the Crusaders were modified in the "Esteban de Luca" Arsenal (AKA the same place where the Nahuel was assembled).
The first to come to my attention was (what i believe to be the first to be made of this things) the example that mounted the 75mm Krupp model of 1909 field gun (gun also present in some Halftracks and in the Nahuel).
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As you can see the gun (externally) retains most of its visual characteristics when comparing it to the common field gun
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The second seen example was the one that had another 75mm gun mounted, this time it was the Bofors mod of 1935 field gun.
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This time, and like the other example, the gun remains extremely similar to the standalone gun used.
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The last of the "gunned" crusaders is the one that carried the 105mm Schneider-Cruisot mod 1928 field Howitzer, supposedly this next picture of of them, but i never found a detailed picture of them, where the gun can be well appreciated.
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The tank and the gun
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But..What about those so called...rocket crusaders???
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Here they are!