CD burner needs replaced and cannot find suitable replacement?

My APS 101629 cd burner is worn out and no longer operates. Need suitable replacement unit either complete or just the burner (have ability to replace the unit myself ) . Must be compatible with Mac OS 8.6. APS was bought out by LaCie and cannot locate parts for this unit. The system is used for recording studio and I would like to find a repair part or replacement unit rather than replacing the entire system.