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Amongst other things...
Here's a good source of manuals.
Free Military Army Manuals!
BTW A1's have a different manual so wiring maybe slightly different.
Bruce, your right the OEM supplied ones had a metal cage. However as manufactures change production over the years I wouldn't be surprised if these were in fact the same NSN with different part numbers but suitable sups for each other.
Technically there is nothing wrong with a plastic cage and...