Old thread but I just fixed this issue so I figured I would put in my $0.02
Rubber Insulator Part #: BE8Z8125A $11.17/each. You need 2.
Old left - New right
Cover pops off towards the front
Replace insulator
Same for left/right. Pop the covers back on and there is very minimal radiator movement now.
Took about 10sec per side and $22.