if i change the rubber blocks under the body between the suspension in front and back (under tank) what will the result be, any benefits, io have em but not using them (bought for the old bug) so i might aswell use em but whatg benefir will i get from it?

It may stop a few rattles... more than likely you will have to re align the doors as it may change the door gaps and affect how they close.

You may have to loosen of a few of the body bolts as well in order to lift the body enough to change the rubber blocks.

worth the bother?