I just picked up two new ground glasses from Steve Hopf in Southern California. He cut me a special size for my 8x10 Seneca Improved and a standard size 11x14 for my Deardorff back. They both have grid and clipped corners. Had them in about a week and a half. Cost me $70.00. I can highly recommend Steve. He is a great guy has great communication and really cares about his craft.