We use a shorter insert with a machined spacer which is mounted on the top of the insert.
This reduces the droop height & ensures that the shock will not bottom out.
This keeps the shock operating closer to the centre of the stroke.
The reduction in droop allows the use of a shorter spring & keeps it fully captive.
Trents struts are an example of this.
http://www.datsport.com/strut-dsk280R.html
We also have a standard insert of the same length as the adjustable insert in the 280R set up.
Any of the short struts ( including R31 )we have produced over the last 5 years can be converted
by changing the spring, insert & bump stop.
Will need our machined top spacer & if our camber tops are
fitted, a new bearing standoff is required.
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A little knowledge is a dangerous thing.
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"R.I.P. Baz. 29 April 2022. Thank you for all your contributions to the Datsun community over the years. You will be missed." - OZDAT