We need a little more info- I assume you need it for the rear of your NP203 and not your rear axle. Which size u-joint do you have? 1310 (probably), 1330, or 1350? If I remember correctly, the rear output yoke on a 203 is the same as a 205; someone straighten me out here. If it is the same as a 205, and it's a 1310, I have a used one or a new one available.
Jimbo