you need to make your question clearer if you only want a yes or no answer. are you asking if they made a D30 the same width as the D27 that came on the 71 jeep or are you asking if they ever used D30s in 71?
the D30 didnt start being used in CJs until 72 and it was 2"s wider than a D27
the D27 was used up until 71 in CJs and 73 in waggys. it was 51"s wheel mount to wheel mount.
you really wouldnt need to narrow a narrowtrack D30 to put it under the front of a 71 that had a D27. the one inch wider on each side wouldnt be noticeable.
"character is doing the right thing even if nobody is looking"