LMU8 Linear Bearings by Misumi
PSFJ Original Prusa MK3/MK2/S 8mm Smooth Rod Kit by Misumi
Heat Treated Hardened Steel Misumi Smooth Rods for Original Prusa MK Series
These high quality smooth rods are cut by Misumi Engineers with lathe precision and they are heat treated hardened steel which should last for ultra long time in a 3d print environment. You can install both on MK3 and MK2/S.
2 PSFJ8-370 Hard Chrome Precision Linear Shaft - Straight 370mm (x) 2 PSFJ8-330 Hard Chrome Precision Linear Shaft - Straight 330mm (y) 2 PSFJ8-320 Hard Chrome Precision Linear Shaft - Straight 320mm (z)
Tolerance diameter: g6 (-0.005 - -0.014mm)