2008 Altima Coupe:
Just did my rear shocks after completing a front strut replacement ... what should have been a 15-20 minute job turned into two weeks (mostly waiting for parts).
When I tried to loosen the rear shock bolt, it would not come out. I did the usual spray with penetrating lubricant, applied heat, etc ... nothing worked. I put away the impact wrench and went with the old fashioned breaker bar determined to break it loose or just break it in general. All I succeeded in doing was turning it so hard I broke the rubber shock mount to pieces, but the bolt refused to come out.
I decided to just re-torque the bolt & ordered the parts I suspected that I would need once I attacked this again. About two weeks later with parts in hand I tried one last time with penetrating lubricant, an impact wrench & heat ... Not budging. Got my angle grinder with a cutting disk, cut off the lower shock bracket & extracted the bolt with part of the rubber bushing attached.
Now to get the other half out of the suspension member. I got a narrow chisel & chiseled away the rubber until I got to the metal ring that surrounds the insert. I then used files, a half round on edge and a triangle file to carefully file a groove in the insert in two places. Then using a screwdriver I pried away the narrow piece & then removed the remainder of the insert.
After cleaning out the area I got the new insert, coated it with anti-seize and using a large socket as a drift I tapped/hammered it into place.
All this may sound easy; it was & was not ... just take your time.
Here's a pic of the shock & parts I removed:
I also replaced the bolts with Nissan Part # 56280-JA00C ... the busing was Nissan Part # 56219-JA00A - pics of the busing ... I did not photo the bolt:
Hope this info helps some of you ....