Specifically of the trailing arm back and front side. I want to confirm once and for all if its actually reinforced over the standard Integra or if its just the longer spindle and stiffer bushing that caused the difference in part numbers.

Thank you..

 

The bushing is the same as all integras. No special part numbers. Honda went through a couple different bushing designs/part-numbers trying to improve durability, but that was it...

Way back when, Mugen was the only option for stiffer rubber. But the current OEM bushing is identical to the Mugen part now (and only cost $25ea).