Wanted:27 tooth black speedo driven gear

[NCC1701]

I am in need of the black 27 tooth speedometer driven gear. The one that the Speedo cable slides into on the transmission. Mine is worn and my needle was erratic. I was able to find a 31 tooth white gear to use temporarily, but the speedo appears to read about 5 mph low at 50mph.
Please reply here. Please price shipped to 92010 in Carlsbad, CA.
Thanks,
Lorenzo
AKA
NCC1701