M3 arms fit fine, and are a nice upgrade (solid balljoints). However, they are pricey. The regular non-M arms are fine for a DD (non-track car). Make sure to get only Lemforder brand parts.
Your car is a 325, so it uses centered LCABs. You need M3 bushings for a 96+ M3, and it will fit just fine on non-M arms. However, as stated earlier, I have the PF stuff in stock if you want those (front and rear).
2007 BMW 328Xi Touring, 6 speed