This isn't going to categorically answer your query, but taking a look through Elyea's massive tome on Vox amps, I couldn't find valve shields mentioned, but I saw pics of several AC30 chassis: some with 1.5" shields, some with 2" shields and some with none, so you would probably be safe in taking your pick.
I did a little experimenting with some tube shields I have here. The 2" types work fine for most sockets, but it takes some maneuvering to get them over the tubes closest to the filter choke.
I am sometimes guilty of assuming that manufacturers of vintage amps were more consistent in their build practices than they actually were. I have to remind myself that, in a lot of cases, they used whatever they could get, and I know that Vox struggled in the mid-1960s to keep up with production demand. After all, they were trying to sell amps, not build museum pieces.
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