I need to know if a power seat can be installed in my 2000 GC that has only a manual seat in it now? Is the wire harness there to do this? I am looking to replace it due to a no support left in it cushion and a broken recliner lever. Also, how hard would it be to replace the recliner lever. It is broken off flush inside. (purse strap casualty)Is it possible to buy a new foam cushion and replace it myself? Thanks in advance for any input.