LMR - The DMBS was to diagram 556 (same as the 3-car sets) and the DTCL to diagram 585:
ER - These had the DMBS to diagram 557 and the DTCL to diagram 581:
Single Engine Conversion
3-car diagrams & Works Pics
2-car diagrams & Drivers Instructions
4-car diagrams & Works Pics
Details about preserved Class 104s can be found here.
Many thanks to Kevin Dowd for his assistance in the preparation of these pages, and to Eddie Knorn for further data.