OK, I now have a better idea of what you are after.
The 3 Pz IV based FlaK variants and the Pz 38(t) should not be seen until '44. The Flakpanzer 38(t) was not manufactured until Nov '43 and issued early-mid '44, mainly in the West. The Pz IV Möbelwagen also not issued until early-mid '44 and the Wirbelwind and Ostwind not until the very end of '44.
The far most likely SP FlaK in late '42 would be the 'soft' FlaK on halftracks.
I would definitely not rule out towed FlaK 30 20L (4), FlaK 38 20L (6), FlaK 36/37 37L (8) or FlaKvierling 38 20L (20). The FlaK 43 37L (12) saw no service before late '43 at the earliest. They could be quite aggressive with towed light FlaK, especially the FlaK 30 & 38 20L. The FlaKvierling and FlaK 36/37 would be a bit much, but possible.
So SdKfz 10/4 20L (4), SdKfz 10/5 20L (6) or SdKfz 6/2 37L (8) for SP FlaK. The SdKfz 7/1 20L (20) was quite rare at this stage, so possible but doubtful.
One wrinkle in the issue of FlaK was a side effect of the Nazi state feudal infighting. In order for Fat Herman to keep his fief and blow the boss, one way was to supply LW FlaK battalions to support the Heer formations. Initially most of the SdKfz 6/2 were issued to LW units, though later the Heer got the almost identical SdKfz 7/2 (the SdKfz 6 h/t production was gradually dropped in favour of the slightly more capable SdKfz 7). Those LW units also got first dibs on the towed FlaK 36/37 37L (8), at least prior to '43.
So for a unit prior to '44:
The divisional FlaK battalion: a mix of 2, 3.7 and 8.8cm weapons. Something like 6 x 8.8cm FlaK 18/36/37, 9 x 3.7cm FlaK 36/37 and 12/24 2cm FlaK 30/38. Could be Heer or LW, usually all towed prior to '43. The trend from '41 was to replace any LW FlaK battalions in division with Heer units.
Attached to divisional regiments/battalions: Any mix of towed/SP 2cm FlaK 30/38 in platoons of 3/4 guns, all Heer. Pz/PzGr/Motorised divisions far more likely to have SP. Depending upon how favoured a division is (SS vs Heer, GD vs the plebs, etc) you could have roughly a battery of 2cm FlaK (12 guns) per regiment (Pz, Inf, Art) and a platoon (3/4) in the Div HQ, Pio, PzJg and Recon battalions.
Independent FlaK battalions held at army/corps level.
This is where you are more likely to find LW FlaK battalions and the SP ones could contain the SdKfz 6/2 as well as the SdKfz 10/4 & 10/5.
So within a Pz/PzGr/Motorised divisional AA assets the ratio for 8.8cm:3.7cm:2cm would be very roughly 1:1:6+.
Given that it's GD + 11 Pz, I would suggest SdKfz 10/4 and/or 10/5 with some pushed/towed 2cm FlaK 30 or 38. The SdKfz 6/2 and 3.7cm FlaK 36/37 would be much rarer at this time, though still available.
The usual caveat that it is a only an informed guess at best, but hope that gives you a rough idea of what might be likely. I simply don't have the exact details.