photos from a single L42A1
https://www.milsurps.com/attachment....9&d=1394540854
https://www.milsurps.com/attachment....2&d=1394540886
https://www.milsurps.com/attachment....3&d=1394540896
https://www.milsurps.com/attachment....6&d=1394540923
The truth is that you may not need anything.
If you are planning to use a UK"L8" magazine the clearance cuts are for the cartridge retaining "feed lips" - but I have used "L8" mags with no alterations to the action.
If you are using a Sterling or modified Indian 2A magazine, the feed lips are within the same location as the .303 magazine, and will not require any changes.
What other magazines has anyone fitted to 7.62 Enfields? | Army Rumour Service