Photo added of alternator. The only real exterior difference is slightly different locations of the + Post and the regulator plug. I haven't had any issues with wiring not reaching in anything I've had to fit.
Just as a heads up also, it comes with a round plug regulator. If you have a 20V you may have an oval shaped plug on the back. If so let me know because I think there is an oval plug 80A unit available also.
One other interesting note, it has a larger front pulley than a standard 4AGE type one = slightly underdriven to help cope with higher operating RPM's