You're in luck! I was doing some research on an old lamp for a friend and found this site.
Linda C

Here is a link that might be useful: Antique lamp parts

Another place that I have used with great success is Hippo Hardware in Portland Oregon.

There is a great guy from Iowa there -- Cedar Falls area -- who has helped me thru tons of lamp repairs. They also carry a large selection of fabric covered cords for replacement.

Cathy

You might put up a note on the ebay 'I want it now' page or put an ad out on craigslist

Here is a link that might be useful: Antique Floor Lamp Blog

Here's another website of a lamp parts supplier out of New York City. I have used them to buy parts for fixtures when all I had were two antique globes. Their prices are reasonable as you will see. Good luck maybe they will have what you need "www.grandbrass.com"

You can have any antique metal lamp part made at
www.castmetalparts.com
They are a small foundry that does not mind little jobs!
greta prices too!!!

Here is a link that might be useful: That parts Site

Hello, I am looking for a floor lamp glass "break", H4" x 4" diameter. Cone shaped with a normal lamp tubing hole at the top. Anybody got any ideas?