This?
https://www.dinancars.com/product/d...kit-10mm-for-bmw-325i-328i-330i-335i-335is-2/
SKU: D110-0008
The 10mm Rear Upper Shock Mounts replace the stock mounts and increase shock travel by 10mm for improved ride quality and performance. <-- Looks very close to stock, I assume then just make a bushing or two smaller to get that 10mm/0.4'' more travel?
I would think the more suspension travel the better as there is more time to dampen because the strut is longer. For instance would you like your shock to dampen over 6 inch or 12 inches? I could be wrong of course. Suspensions are not my strong suit.
@barry@3DM
GC being ground control? I was not aware they made rear mounts for our struts? Link?
7mm or 1/3 of an inch is still pretty small. Obviously while in there do it but not sure if it would be worth the upgrade alone.