SGS Engineering in Derby stock 2 versions for the HPE, standard and VX, the latter to cope with
the weight of the spoiler.
They are rated at 670N and 830N respectively, otherwise identical in size.
I originally bought VX versions in 2020 thinking they'd be 'better'. However they are quite strong.
So this time around, due to juddering, I bought standard replacements.
After fitting them I found they barely held, and given the slightest nudge, down it went.
So I returned them, and ordered the VX type again.
I think that an ideal pressure would probably be around 700/750N for the standard hatch but custom
struts are probably more expensive.
Nigel