3in 20cwt AA and 3.7in AA not found?

[Cross]

Sorry in advance if I'm being dense, but I can't find these AA guns in the OOB. The only British AA Bty I can find is the 40mm Bofors (#64)

I did find a 3in gun empl (#395) but it's a fortification, despite the photo of a towed 3in AA.

I would think these would be quite standard pieces with their longevity and widespread use, that even includes a direct fire AT role on occasion.

I have the upmost respect for the comprehensive work you guys do, so I'm thinking there must be an explanation I'm not aware of.

Thanks,
Cross