| Part Number | Description |
| 8527430 | PCB "UP" BACKPLANE 64A MODULAR FO3X/FO4X/FO |
| 8527950 | CHASSIS ASSY 128A POWER SECTION 13 FO40 |
| 8528550 | PCB POWER UP/ADD'L 32 AMP UPGRADE FM20/FO20 |
| 8528760 | PCB POWER UPH/MICROFIN II OPTION for FM20/F |
| 911076 | RAIL/SLIDE PLASTIC UP & UPH PCB'S |
