Early Luke III's – single coils?

On the 1st gen LIII’s, before they went to the EBMM HH pickups, when the HSS model had a Transition in the bridge, what pickups were in the neck & middle? I did some digging, and it seems they are “custom wound Dimarzio single coils”?

And are they noiseless, since they have a preamp? The newer LIII’s (with the HH humbuckers) also have MM single coils, and they are specified as having a “noiseless circuit”.