Trick is you have an army series 3, not a civilian one, that part of the chassis is a little different

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1981, Series 3 FFR. 33-727 - Grover
1961, Series 2 Ambulance. 108-098 - Eden

Registry of Ex Military Land Rovers Mem. 129
Defence Transport Heritage Tasmania Mem. 12

You know, strictly speaking, throttling the staff is my job