dude, its a bush...

the bush is pressed in, hard race or oem

dont cheap out with some crappy poly one or other chinese equiv... (especially when it costs upward of $500 for some mechanic to unnecessarily remove the whole trailing arm from the car to press them as they havent the tool needed to keep the brake lines and abs lines attached like I do which makes it a breezy job)

they dont last ten years ether (if you drive less than 20,000kms a year maybe)... its a high stress point area in the trailing arm, note the size of it and bolts needed