What pickups are in my 88 540R?

[OklaStar]

They are all IBZUSA pickups with no other markings.
What are they?
thanks for the help

[gpenguins]

They are IBZUSA first generation pickups. They are made in the USA by Dimarzio, the singles are stacked humbuckers. I've heard people say the humbucker was something on par with a PAFPro, but I don't know that I've ever thought that exactly.

[OklaStar]

Thanks, they sound very very dark and midrangish. I was wondering if someone had modified the control pots or if all 3 pickups just sound that dark.