We have had a number of M2 customers running our 18x10 ET33 fitment square. We recommend a 10mm or 12mm spacer with this fitment to aid in clearance to the OEM suspension. Camber is required for this.
The 437M is a 19x10 ET40. So you would need at least an 18mm spacer to make this work. We would recommend close to -3˚ of negative camber if you wanted to fit the rear 437M up front as a square fitment.
I hope this was helpful
- Max