I wouldn't feel quite that confident in the replacement diodes. The stator current flows in series through 2 diodes at any given time and the current cycles between the diodes as the alternator rotates. So for a portion of the time a given diode will be passing 100% of the current - but not all the time since they "take turns." I don't know how the diode package was rated, but I think the 50-amp rating is marginal for a 60-amp alternator. Given that, the alternator will rarely, if ever, be asked to deliver a full 60 amps, and there is certainly some margin built into the diode rating. And the rating is a function of operating temperature, so if the alternator stays cool, it's better. If you could find a diode assembly rated at 60 amps or more it would be a good thing. The 50
amp assembly will probably work okay, though. It's just not 50A X 6 = 300A. And if you routinely fly IFR at night with everything turned on and lit up....well, that's up to you.
Gary Casey
The diode assembly was sourced at my local shop with a spare set of brushes for $20 total. These are 50A diodes (50A x 6 diodes) which is a robust replacement satisfactory for even the 100A alternator. I had to remove the B+ stud from the old diode assembly and press it into replacement diode package. The re-assembly took about 20 minutes and it fired up with 10A charge on low engine idle. This is much higher charge at low idle than I can ever recall.