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These silicone O-rings they help seal the BLITZ gear diffs from dirt and leakage. They can also be used as an upgrade part for Firestorm and E-Firestorm gear diffs for a better seal than the stock X-ring (#86898). Each package contains 10 O-rings.
Royal mail at £3.50, or Express at £6.95.
Full details at checkout.
Some items cannot be sent via Royal Mail due to their restrictions.