The previous owner replaced 3 of the 4, "ran out of time". What I have installed are the front two ES bushings, 1 Rear ES bushing (with one type of collar) and 1 rear factory bushing (with another type of collar).
I'm not sure if I should have any collars installed with the ES bushings. Pics to show...
spare collars and ES bushing:

ES bushings, no collars:


Drivers stock bushing, 1 type of collar:

Passenger ES bushing, other type of collar:

