Thanks Willie_B.

i just purchased / returned the 7Ent part.
it was a remanufactured product but it was different in dimensions compared to the original.
height too small, opening diameter too small and not a true circle.
i would need to cut the plastic sleeve and file down the subframe for it to fit.
so... I am looking for an original used one.

https://www.ebay.co.uk/itm/21a1757-retainer-hose-protection-sleeve-Hydro-rear-subframe-/382291713207

Shipping is crazy though.

https://www.7ent.com/products/retainer-plastic-sleeve-rear-subframe-21a1757.html 7ent shows them.

I am in need of one triangular metal retainer for the plastic sleeve that protects the 
hydrolastic displacer.  This is for the rear subframe.

Seems these are hard to find.  part number is 21A1757.
If you have an extra you can contact me via my profile email address.