They all use the eight-pin octal base. I’ve never seen an 6SN7 with the ST glass envelope. Chinese company Linlai makes some with the odd shape envelope.
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I have some 6sn7 socket savers but they all seem like not the greatest quality. Garage 1217 makes some very nice quality tube adapters, ceramic and gold plated pins. Not sure if they have socket savers. I had their 6sn7 and 6922 adapters for a MHDT dac, they may be able to make what you want. They are very nice people give them a call they maybe they can help.