Just put a Fast Ratio pitman and Idler on from
www.firmfeel.com to his existing box.
The only thing significantly special about the T/A box is that is has internal stops to prevent some complete idiot from cranking the wheel to full lock, holding it there, and possibly rubbing against the inner frame rail.
People do this all the time and they don't buy the "T/A" stamped box. That's a waste of money for a car that didn't originally come with one.
I think Firm Feel can rebuild you box with the changed internal stops just like the original T/A box if you wish. And you get a good rebuild box, instead of one off some parts car that's been sitting around for 10-15 years plus.