For '71 Duster - center console floor mounting brackets; floor shifter assembly and/or complete shifter linkage between shifter and transmission
Whatever you buy you may have shipping costs as a big factor for high prices. If you shop around, you may get better prices. I bought a used set up and the shift lens was scuffed up, so looked for repro and prices were over $40. On ebay got it with shipping and tax $42. And it actually came from a big Mopar vendor.