1634143 Single Bottom Roller Fits CAT Fits Caterpillar 320C 320One New Aftermarket Replacement Track Roller Group that Fits Caterpillar Models: 311C, 312, 315B, 315B L, 315C, 315D L, 317, 317 N, 317B L, 317B LN, 318B, 318B N, 318C, 319C, 319D, 319D L, 319D LN, 320B, 320B L, 320B LU, 320B N, 320B S, 320B U, 320C, 320C L, 320D, 320D GC, 320D L, 320D LN, 320D LRR, 320D RR, 321B, 321C, 321D LCR, 323D, 323D L, 323D LN, 325D, 325D L, 345C L Replaces Part Number: UNI70 0025, 1634143, CR5109V, CR5572