5274 Backplate/ 20x1.4mm O-ring (for engines with starter) (TRX 2.5, 2.5R)
https://www.ludingtonhobbies.com/shop/5274-5274-backplate-20x1-4mm-o-ring-for-engines-with-starter-trx-2-5-2-5r-13704
https://www.ludingtonhobbies.com/web/image/product.template/13704/image_1920?unique=d8bd69c
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Manufacturer's Part #: 5274
