PERC
The stator is a 4010297 and was found on 2001-2006 big block liberties. (700-800) so your stator is fine.
flwyeel is different, 18 degree, 4010677 and is stock on 2003-2005 big blocks.
Need a CDI and the associated harness that has the gray wire that connects to the button on the left hand control. You can also use the Pro X reverse button that mounts to the hadlebar. It's a momentary connection, just like the other control. I sends a connection to ground to the CDI to initiate the reverse sequence.
The oil pump is different too. Use the Polaris cross reference web page to check for models that the flywheel is on becasue I found a newer 500 with PERC that had the 18 degree flywheel, same part number.
Team clutch with helix with ER in the designation is the last item.
Will be doing my sons 2002 800 shortly and then we'll sell the mechanical reverse. i picked up the harness, CDI with DET, CDI harness, DET sensor, oil pump, and handle bar control. We had already upgraded to the Team cluthc with appropriate helix in anticipation of adding PERC.
Blue Dave on e-bay (Devils Lake ND) sells conversion kits but the XC doesn't use the Team clutch and doesn't include the flywheel. I'm not sure if the 14 degree stock flywheel works or not. they aren't expensive if you find one used.