Hi and welcome to the board. Hope you can get back to being as adored as are the glasses by finding replacements!
Your first port of call might be
www.replacements.com who have a huge database of designs and carry a lot of replacements, or know where to find them. If you visit their website it explains how to send pics to them so they can help you find out what pattern and who made it.
If you happen to know that already, then you can check their alphabetical list of makers for them. Look under Crystal, as this covers both crystal and glass. Good luck!