On the 1991 325, I saw no wires going to the bell-housing.
On the 1985 325, I saw wires going to the bell-housing. Presumably, these are for the flywheel position sensor.
And, the bell-housing otherwise seems to be the same, i.e., it didn’t get re-cast to not have the holes where the wires go in.
I offer used bell-housings for $20 each.