I grabbed 4 random PC 3.5" drive handy.
Newtronics (mitsumi) D3395
ALPS IBM P/M 06P5226 FRU 76H091
In the common PC they are interchangeable and do 720/1440.
The only strange ones are the pulls from model-50 MCA bus machines
and those have 26pin connectors with otherwise normal signals
(fewer ground pins).