Steam Community :: Guide :: How to make your G27 manual shifter, a sequential shifter PLUS G29 Shifter mod.
Amazon.com: Obokidly DIY Sequential Shifter Knob mod Upgrade Modification Steering Wheels Accessories Parts Set for Logitech Shifter Gear Shift Knob for G29/G25/G27 for PXN A10 Compatible with PC for ATS & ETS2
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Logitech G27 G29 Sequential Shifter Adapter and racing shifter knob Sim MOD | eBay