FYI, I just picked up a 150A alternator. It's even larger than the 143! I'll take some photos of them side by side. I'll be installing the 150A on my other car, and will do some testing to see if it performs any better than the already fantastic 143A. I think it will still fit, most of the size difference appears to be front to back, but I'll know for sure when I try to bolt it up. Stay tuned, I should have it done in a few weeks...
(now, if I could just snag that 180A alternator from the E55 AMG...
)