HELP: Replacement Light Shade/Globe

I apologize for the cross-post on both forums. We're living one of the Fairgrove Cupertino Eichlers, circa '61. We just broke one of the original white glass light fixture globes in the kitchen and I'm wondering if anyone has old ones they'd be willing to sell.

I've looked at all of the lighting links I have come across and have not seen these globes. Any suggestions of where I might have one custom made if I'm unable to track one down?