tuff wheel/rimblow adapter.

zhandfull said

They are longer and countersunk. Although I haven't installed one of these adaptors I would think a standard nut and washer may work. They are usually covered by the center cap or horn button.

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The can installs on the column, Then the three nuts your looking at hold your Rimblow or Tuff Wheel on, rounded part toward wheel. If you look at the wheel you have you will see the countersinks for the special nuts. Tom over at R/T specialties probably has the nuts. If not Pm me I pretty sure I have a set. Larry