R2005bmw

I recently bought a 2005 525i . The car has d2 lowering springs and shocks and strut kit. The ride height looks about 1.5-2" lower than stock. It seems that the right front strut is blown out . If i go over a bump you can feel it bottom out. Im thinking of going back to the origional ride height. What is a good and cost effective brand and setup to go with? I cant seem to find a replacement set of struts for the d2 set up. Thanks Richie