Nissan might still have them, as they are still using the same box in South Africa.

But it's easier to collect them at the wreckers, there are about 4 different shim sizes for the tube/column endfloat adjustment. Should only need one of each thickness for your collection. You can sollect them from various Datsun models.

For me, it's a mix and match affair. Collect several boxes based on my tests, loosening off the adjuster and checking for sector shaft bushes. I haven't looked for a supplier yet, because I had a good set 'in stock' from years of collecting parts.

A good steering unit will:
- not have a worn top bearing near the steering wheel..that's the sign the car has done more than 150000miles.
- not have any sideways play in the sector shaft.
- have minimal free play on the steering in the centre position, after you tighten down the lash while on full lock. This shows how much wear on the ballnut/sector shaft gear in centre position.