Has anyone put factory Sport springs on a 535xi?

I went taller on the tires for my 20 inch wheels so that got rid of most of the gap, but I still want it down about another 1/2 inch. Unfortunately im not reading much good about the H&Rs, and the budget doesnt support coil overs or the $800+ spring kits so the options are pretty much dont touch it, H&R or trying someones take off Sport springs.



Unfortunately most write ups are limited and I dont have a set of stock springs and sport springs to take measurements, so has anyone ACTUALLY tried fitting the factory Sport springs on a X-drive?