I know this can be done by bending the hydro displacer mounting lugs iin the subframe to accommodate the rubber springs and changing the trumpets and trailing arms to the dry type.

However, according to Calver, this is not advisable because that curious metal cone shape on the dry type acts as a variable spring platform - progressively increasing the spring rate as more load is applied. Carrying more load in the boot or back seat will have the tyres bashing the wheel arches.

Is this really an issue?

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1965 Mini Van (1360)
1970 Mk2 Cooper S (1310)
1978 Rover SD1 V8 (4.6)
1996 Land Rover Discovery V8 (4.0)

there is a rising rate difference between the 2 trailing arms ,,, the location of the Knuckle joint is different on the arms... the hydro type have way more leverage

& there is also a distance difference between the 2 subframes.

once the hydro bag locking tangs are bent out of the way,,, & the trailing arms are modified to suit the mounting/fitment of shockys (or swapped over to the dry type trailing arms), & as long as you fit hi-lo adjusters & extension rods then all should be well & good

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No offence intended here but--> anyone writing a book about minis 30 years ago may not have experienced such worn or stuffed-with components as we are finding these days.

You should put your heart & soul into everything you do.

I’m referring to the mounting base of the two types of subframes where the displacer or rubber spring bases sit. On the dry frames there is a metal dome that protrudes outwards from the base of the frame that the rubber spring butts up against. On the hydro frames this is not there, instead of a dome there’s a type of flat cup-like metal piece with the retainer tags on it to hold the displacer in place.

The dome on the dry type acts as a variable spring platform - progressively increasing the spring rate as more load is applied.

These photos demonstrate the difference between the two subframe spring bases
miniproject2.wordpress.com/2010/06/07/dry-to-wet/

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Slide
1965 Mini Van (1360)
1970 Mk2 Cooper S (1310)
1978 Rover SD1 V8 (4.6)
1996 Land Rover Discovery V8 (4.0)