Anyone replace their alternator yet with a 143 or 150 amp unit from an S-Class?

I'm curious to if there where any complications involved.
I looked online at Importec.com and a 2001 S420? 143 amp is going for 179.99. I would be looking at either this one or the 150 unit.

The current unit in my '97 E300 is rated at about 90 amps is feels relatively weak. I know people will recommend adding a capacitor near my sub amp, but I've used them before and I feel a stronger alternator and good siz battery work better for a basic setup requiring a little more power than stock....

I believe that I would need to only install the pully off of my old alternator and the new alternator should line up in the same exact spot?

Thank Guys in Advance!

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'97 E300
'99 E300