I know you are looking for the slant to 727 cast iron adapter. It might be easier to locate a slant-specific 727 used after 68 or so and definitely found in taxis, non-pursuit cop cars etc that needed the HD 727. My buddy had one and neglected to tell me he had it. He sent it to the recycler! I actually have an adapter and will use it in my slant-equipped 87 D100 when I convert the transmission to a 518 OD.
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