Converting a 4L60E from electronic to cable speedometer...

The goal here is to convert a 4L60E from a '94 Caprice from an electronic speedo to a cable speedo. From what I’ve found in my searching is a $400 kit that look like this:

http://www.shiftworks.com/tailhousing.htm

The first tailshaft, SW41-A is what I would need…

http://www.shiftworks.com/sw41.jpg

Seems like a large chunk of change…anyone know is any of these parts can be purchased seperately so I could piece a kit together???

just buy a 700R4
same thing but not electronically controlled

I should note that the trans in the Caprice was recently rebuilt with a saucy torque convertor…so that is staying for sure. I’m just trying to save the stock speedometer gauge on this '55 Chevy that it’s going into, and would really prefer to keep the computer/electronics as unmolested as possible.