evening diana 
that is the landrover released oil slinger plate mod to overcome mainshaft wear, prior to the drilled input gears being available. the important thing to remember when fitting it is the o ring around the outside needs to be fitted, and the top oil inlet slot is not to be obstructed by silicon seants etc.
yes it is interchangeable to the disco r380, it even fits with the lt77 but the thread needs to be cut off the end of the mainshaft first...
they worked very well, but iirc are difficult to obtain now.
jc
The Isuzu 110. Solid and as dependable as a rock, coming soon with auto box😊
The Range Rover L322 4.4.TTDV8 ....probably won't bother with the remap..😈
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