Yes... quoting myself again. Sorry!
Don't think all glass stems or adapters are available or still being produced. IMO, you don't really want one anyway. They may be just a tad better for concentrate screens, but can do the same with adjust-a-bowl screens. Adjust-a-bowl GonG adapters (up until recent run at least), allow you to tweak your usage.
@SecureSwede ... Might want to send an email to Epic about the GonG and see if the glass stem part is long enough for adjustment. Seems some issues with those that are recently produced. Not sure just how bad these are, having not seen one myself, but best way to connect to water piece is through a properly functioning GonG adapter.
And, don't forget the discount code FCLOVE. Will get you 10% off.