Just out of curiosity and relatively low price, I went ahead and ordered the STB for the Q50 to test fit. If it didn't fit, no loss, I could just resell it.
End result: IT FITS!!!! with absolutely no modifications, or major adjustments. Installation was simple, and I was already driving it in less than 20 minutes. I did notice a slight improvement in turning, and steering seemed to be a bit more responsive.
Anyways, it was late so I didn't take any actual photos after the install but, here is the pic of the STB installed on the Q50, taken directly from Tanabe website:

*Disclaimer: Install this STB at your own risk. Tanabe USA has not specifically fitted/tested this for the M37*


