Xpands makes the JVC Glasses, but the difference between the JVC branded ones and the Xpand ones is the JVC ones are polarised horizontally, and the Xpands are vertical.There’s a thread that references these as being compatible with the JVC and being from the same manufacturer.
Are the JVC glasses really my only option? I might as well have not bought the adapter at this point...
As far as I know, your only option is the JVC ones.
Unless @zombie10k knows something I dont...