iDR-32. iDR-48. Back up PSU kit

The part numbers are:

003-996 iDR32 PSU upgrade kit.
003-997 iDR48 PSU upgrade kit.

The kit is the complete rear metalwork with the new PSU.

Remove the rear metalwork, unplug the PSU.
Plug in the new PSU and screw up the new metalwork.