I need to buy one front wheelarch and on both sides "triangles" in front of those - part 6 in the attached pic.

https://www.realoem.com/bmw/enUS/showparts?id=BU51-EUR-01-2007-E85-BMW-Z4_30si&diagId=51_4951
Those triangles are stupid expensive from BMW, so I want to buy them used, but they changed P/N late 2005. Now, LCI started in 2006, and you cannot get this old P/N anyway, so are those parts compatible between LCI and pre-LCI Z4s? Most parts cars I find are pre-LCI and mine is 2007.
EDIT: Actually, same question about front bumper carriers (between bumper and fender) - new ones introduced with LCI, but old ones not available anymore, so do they both fit the same?

https://www.realoem.com/bmw/enUS/showparts?id=BU51-EUR-01-2007-E85-BMW-Z4_30si&diagId=51_4951
Those triangles are stupid expensive from BMW, so I want to buy them used, but they changed P/N late 2005. Now, LCI started in 2006, and you cannot get this old P/N anyway, so are those parts compatible between LCI and pre-LCI Z4s? Most parts cars I find are pre-LCI and mine is 2007.
EDIT: Actually, same question about front bumper carriers (between bumper and fender) - new ones introduced with LCI, but old ones not available anymore, so do they both fit the same?