Jim's Auto Parts sells all the parts you need to do a stock rebuild.
http://www.jimsautoparts.com/steering_parts.htm
Not sure if they sell them built already.
I think Mancini Racing might also carry stock style replacements - can't remember.
Or you can go aftermarket with a stainless U-joint style from Flaming River. That's what I did, but it required cutting the steering shaft (1/8" - 1/4" if I remember correctly)