Need Replacement Eichler Light Globe-Need info or availability

I need to replace a broken light globe on the pendant light outside the front door of my Eichler. I believe it's a 12" globe. If anyone has one available for sale or donation, I'd be interested. If not, because of the way my globe broke, I can't tell for sure what the diameter of the hole is. There seem to be globes available with 5 1/4, 5 3/8, and 5 1/2 inch openings. Does anyone know what the actual size of the globe opening on the original Eichler globe is, and if 1/4 inch will make a difference in whether the new globe is suspended securely? PLEASE HELP!