He's switching to a contemporary Fuji Connoisseur. Shouldn't be JIS anywhere. All parts from the Vitus should be compatible. Only caveat will the the brake calipers' mounting bolts. The 979 came supplied with specific wider flanged bolts to match the bridge at the rear, and sit flush in the aluminum fork. At least that's what Vitus recommended you use instead of the factory supplied ones on the calipers. If you no longer have the originals, you'll need to visit your LBS.
I wouldn't have thought of this one! When I built the Vitus I just hung late model Super Record brakes, so no special bolts.
I'm probably going to take this to my LBS to do the cabling & anything I get stuck on.