It holds the back of the transaxle (MTX-75) to the frame. It should be replaced whenever it wears out, which is easy to see if you get under your car. This one will help prevent wheel hop, so you may want to switch out the stock one if wheel hop is a problem for you. (Wheelhop: when your front wheels slip and cause the engine/transaxle assembly to slam back and forth). The only downside is more vibration and noise in the cabin, since this part cushions less, being made of a very hard polyurethane material. For pics and more info, see
http://www.contour.org/ubbthreads/showflat.php?Cat=&Board=groupbuy&Number=803752&page=&view=&sb=5&o=&fpart=all&vc=1Note that the price change is the reason for the new thread.
