That's right
GS6-37BZ. I always cringe when I would go full throttle in this car, thinking "any day now" lol. Glad it happened when and where it did, I was able to pull over with no issue. Shifter was stuck in neutral and won't shift into any gear. Towed right to my trailer.
GS6-53BZ won't fit in the tunnel (E46 M3 trans) as far as I know, although I haven't tried. 53BZ pilot bearing is in different location as well. I'm stuck with this transmission with my current setup as far as I know.