Vitamix 12 Cup Food Processor Attachment w/Self Detect

Brand new! We received this for our wedding but it does not fit our Vitamix base. It only works with Ascent and Venturist model Vitamix bases. We have never used it. We just did not return it in time. https://www.vitamix.com/us/en_us/shop/food-processor-attachment Open to a trade for another brand new food processor