you need the adapter brackets for 6.5's to fit in the front, because stock is 6x9.
the rears are 6.5s.
heres an adapter that fits the cherokees 6x9 to 6.5".
http://www.sonicelectronix.com/item_4965_Scosche+SA69.html
i just ordered the Image Dynamics CTX65CS and a 2chan amp for the front...