IBM R31 - Manual (Page 233)

Ultrabay devices:
Description FRU No.
CD—RW drive (SONY) 08K9617*
Diskette drive (TEAC) 08K9606*
Diskette drive (SONY) 08K9607*
SuperDisk drive (LS120 x 2) 05K9235*
SuperDisk drive (LS240) 08K9615*
ZIP—250 drive 00N8254*
2nd HDD adapter 08K6067*
Ultrabay Plus device carrier 26P9388*
Ultrabay Plus numeric keypad 19K2056*
Ultrabay Plus cradle for WorkPad c500 series 26P9389*
MT 2656, 2657, 2676 227