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I believe the difference is the 'D' prefix denoes that the bracket has a provision for the seat belt, while the 'C' prefix has you mount the seat belt to the transmission column.
Technically you should mount the inner lap belt anchor to the transmission column as was the way its as done on the 924 and early 944's. Depending on rules, you may not be allowed to anchor the lapbelt to the same point the seat mounts to. Later style cars had the inner lap belt mounted on the seat.
I am pretty sure there is already a marked location on the body to drill the hole for the lap belt, but you still need to use a backing plate on it.
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Jon
1988 Granite Green 911 3.4L
2005 Arctic Silver 996 GT3
Past worth mentioning - 1987 924S, 1987 944, 1988 944T with 5.7L LS1
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