I have several factory S10 short throw shifter bases for sale. Send me a PM if you might be interested. Saves you the trouble of building a spacer plate and moving the pivot pin, although that works well too.
I wrote up a little DIY on my BLOG showing how I made a few changes to mine. Here's the link.

1965 Chevy C10 Shortbed 1/2-Ton Stepside
Truck College
In the Stovebolt Gallery
In the Project Journals Forum
The Build BLOG on Weebly
T5 Transmission Build page