[Saunders17283]

Just wanted to add some final clarity on this thread...

I just talked to H&R directly and their ONLY tested spring for my M850i GC is the 28671-6.

He said, while the specs (coil size, etc...) are the same on the 28671-1 (which is intended for the M850 Coupe) and the 28721-2 (which is intended for the M550), the springs may physically fit on the vehicle just fine but are definitely different and are setup & tested for the weight/distribution of the vehicle they are intended for. He said, while they could indeed work (just like the M550 springs work on limeypride's M8C GC), there is no guarantee.