Here's my Ebay ad
Parlec Optical Zero Gage
From the Parlec website http://www.parlec.com/pages/spindles_adapters
Optical Zero Gages
* Precision machined from high-grade alloy steel.
* Through hardened to RC 60-63 for high-wear resistance.
* Tapers ground to AT2 or better, per ISO 1947, for unmatched precision.
* All zero gages are calibrated in our gage lab and laser etched with actual dimensions.
Part Number Taper Projection
P50-20ZG3 ISO 50 76.20
Comes safely packed in a Pelican 1300 hard case
I'm asking $75, but I'll take offers