Sparco Pro 2000 QRT Seat - Non-Reclining - FIA Approved - Side Bolsters - Harness Openings - Fiberglass Composite - Fire-Retardant Fabric - Black 600010105 The serrated/helix combination design also

The serrated/helix combination design also reduces intake whistle that occurs with helix-only designs

It also fits in the step well of the trailer

7-5/16 in Flange

there are two each of the oil gallery brushes since they get the most wear

540 in Bolt Centers

Sparco Pro 2000 QRT Seat - Non-Reclining - FIA Approved - Side Bolsters - Harness Openings - Fiberglass Composite - Fire-Retardant Fabric - Black 600010105 The serrated/helix combination design alsoProduct Description: Seat Pro 2000 QRT Non Reclining FIA Approved Side Bolsters Harness Openings Fiberglass Composite Fire Retardant Non Slip Fabric Black Sold Individually Since 1977, the world's top professional drivers choose Sparco more than any other brand.