Part number for the aftermarket bearings is HMK2025.
According to the Kawasaki cross-reference list that I have ....
Swingarm seals 92049-1011: 78/79 KX125, 78/79 KX250, 79/80 KLX250.
Swingarm bushes 42036-1007: 78/79 KX125, 78/79 KX250, 79 KDX400.
Swingarm bearings 92046-1001: 78/79 KX125, 78/79 KX250, 79/80 KLX250.
But even though the part number can change with other models, the proof is in the fitting.