What is the correct ride height for the Australian Cooper S with hyro suspension.
I understand there is a factory measurement to set the car at the correct height.

The Scientific Publications/Gregory'sbook says 12 3/8 inches at front. The factory book says 12 5/16 inches (vertically) from wheel centre to wheel arch. Being hydro, you can set it wherever you prefer. Lower gives slightly better handling and higher gives softer ride.
I set height using 2 fingers held together then pushing them between tyre top and wheel arch. Judging how far in you can move your fingers gives a very accurate comparison side to side. The rear ride height can't be adjusted separately without removing the rear struts and shortening them as needed.

How phat are your fingers Bill

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"Show me the Mini!"

Yes I also use two fingers for the front height but don't cut the rear struts as you cant replace them. Proper fix is to install a washer between ball foot and front trumpet

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1969 Cooper "S"
1967 Mini Deluxe
1973 Clubman Van (the fleet spare)
1978 ex 1275 LS ("Wizard" Eaton Supercharged)
2015 HSV GenF GTS(occasional drive & tow car)
2019 MINI F55 Cooper S

I like to see the driveshafts close to horizontal, and trim the height accordingly.
Not sure if this theory is correct though.
However, I do know the plastic ball foot cups in the arms need to be in good nick.

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1967 Cooper S - new front bearings to do.
1965 Cooper S shell - Slow progress. No time or money!
1966 Deluxe- next rustoration!
Mk 2 & XJ6 Jags. Less said the better.

They are within BMC General Data specifications and therefore always slightly too large to reach any component needing attention on a mini.

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"Show me the Mini!"