Parts are rare for old UK or Oz made racks.
The last Mini rack made here was the AYA6001, these are more robust and more parts available.
These are a short version of a Morris 1100 rack, the rack bar inside is bigger diameter.
However I've not seen their tie rods new either for many years.
Usually these later racks just need them adjusted.
Their lock nuts are still available.
Ditto polyurethane hex rack bush, preload (wave) washers, boots, pinions and pinion seals.
Matt Read in Brisbane keeps rebuilt ones. Filled with OIL not grease.
This rack fits all Oz Minis 61-78.
PM 'theminiman' on here, or check Readspeed Mini Mecca in the Australian Mini businesses forum here.
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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.