Ebony sharps for 1900 Steinway A

[Frank Weston]

Where can I find ebony sharps of the proper dimensions for a 1900 Steinway
A grand (3 3/4" in length and untapered)?

I've tried Steinway, and their pre-1984 sharps are plastic and too narrow. 
I've tried Pianotec, and their ebony sharps are tapered.   They are out of
stock on the untapered.

Any suggestions?

Frank Weston