Reluctant to spend big money, I have been internet surfing and found this page.
https://www.onlinecarparts.co.uk/oenumber/534400w102.html
The first 5 are listed as BONNET springs and the last two as BOOT
Towards the bottom are listed 2 boot air springs BUT both out of stock.
However the top item, Maxgear appears to be the same spec as the Ashika boot item.
If they are the same then these are cheap.
Is the boot spring the same as the bonnet one?
I am no expert on these things but are the specs the same, are they interchangeable?