1998 should have the wire harness in place, but you will need to add the heavier cables from the battery to the starter.
Honestly, the biggest issue is the ring gear. Finding it might be easy, but installing it might be difficult. Best bet would be to find a whole clutch with the ring gear already there, but that ups the price a lot.
The reason installing can be difficult is that the clutch has the flat spots for the ring gear, but the holes for the bolts are not there. You have to drill and tap the holes. Not to difficult until you realize that you have to center it perfectly. Even 1 mm off will make it rattle and cause wear and tear on the crank bearings and seals.
Even if you get it perfectly on there, it still might need to be balanced.
2015 Skidoo Renegade BC 600 Etec
1999 Skidoo Summit X 670 HO (Son's)
1996 Skidoo Touring E 380F (sister's)
1995 Skidoo Summit 583 LQ
1985 Skidoo Tundra 250F
1999 Arctic Cat Jag 340F
1999 Arctic Cat Z 370F (son's) - needs track
1990 Arctic Cat Jag 340F
1982 Arctic Cat Panther 440F