Those are stock replacement arms. I have to use pliers to pull them thru the slot. And they are already lubricated with some type of oil to make installation easier. The only other thing is that I haven't tightened the control arm to frame bolts down yet where the shims go.Looks correct as far as being on the proper side. Are those arms original or aftermarket? Just wondering. The slot opening may make a difference. Those rubber bumpers should be a pita somewhat to get them installed. If they go in rather easily, there could be treachery afoot.