These are the same things right, just different terms??? I got a 2002 Cavalier Ls Sport lowered on Tokico D-specs w/ B+G sport springs.....
I got a minor issue w/ the rear squeeking over little bumps..........

My question is do the rear have rubber insulators, ( rubber ring piece right???) on the Top between the spring and the bottom of the Strut Mount??? Or is the REAR strut mount where the spring sits on the bottom just rubber overall??? I forgot if it did or not when installed a while back.........this could very well be the cause of that mysterious and annoying squeeking sound..........Any Ideas??? Thx!!!

its insulator.

they are front and rear and always between the spring and the struts spring perch.

in the front there is also one at the top between the spring and strut mount. since it turns when you turn.

the rear the strut mount is rubberized so there is no need.

You don't really want to isolate the spring. The car kinda needs it.