As seen on a listing at 'that' auction site, "VOLVO HAS DISCONTINUED PRODUCTION OF THE "D" SERIES" duo prop. It appears to be replaced by the "I" series. I suppose if you need a replacement on either the front or rear of a "D" series, this could be a good thing (discontinued item pricing) or a bad thing (no longer available after stock is gone). In either case, be aware.
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