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These steel drive bobbins fit all common slotted style floating rotors. They are available in three lengths and are sold in kits of 10 pieces and 12 pieces which include drive bobbins, screws and heavy duty washers.
All associated parts and sub-assemblies for the above product are listed below:
| Part # | Description | Racer |
| 21120 | Drive Bobbin Kit-.420 Long-10 Pieces | $57.60 |
| 21121 | Drive Bobbin Kit-.420 Long-12 Pieces | $69.25 |
| 21122 | Drive Bobbin Kit-.480 Long-10 Pieces | $57.60 |
| 21123 | Drive Bobbin Kit-.480 Long-12 Pieces | $69.25 |
| 21124 | Drive Bobbin Kit-.638 Long-10 Pieces | $57.60 |
| 21125 | Drive Bobbin Kit-.638 Long-12 Pieces | $69.25 |
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