Old MX55 issues. Info needed.

Trying to hunt down a part number for the bottom rollers on a early 90's Mitsubishi, MX55, excavator. 6 out of my 10 rollers are shot. I've ordered 2 manuals, and so far, no part number. Does anyone know if there is another roller that works with this machine? All I can find, is a CAT 303.5, is supposed to be the same machine, but the rollers mount differently. If anyone has ANY info, or a lead on some parts, it would be a HUGE help. I want my machine to run again! Thanks in advance.

Old MX55 issues. Info needed.