Replacement backplate with 20x1.4 mm o-ring for TRX® 2.5, 2.5R, or 3.3 nitro engines with starters.Traxxas 5274 Backplate with O-Ring for 2.5, 2.5R or 3.3 Traxxas Nitro EnginesSKU: 5274$12.00PriceQuantity*Add to CartBuy Now