So I'm contemplating getting the Bilstein Struts for my 13 Edge SEL to replace the Monroe quick struts that's been on for 2 years, (that I posted about) but I would use the springs that came with the Monroe's the Bilstein I'm looking at is B4 OE replacement or B6 Struts? If not then I'm just going with the KYB strut plus. Anybody know anything about the B6's or the OE replacements?