That old spoiler is terrible and your M3 deserves better. Do it the right way and don't put it back on. I say respray the trunk and install the new spoiler. Good luck and please post the end result!
2008 IB E92 M3| BBS | KW | Arkym | Platte Forme A.G. | Active Autowerke | K&N | Fabspeed | Dinan | Evolve-R