13A408 up for sale is a new gasket seal deere and co p/n R50390, this is used in a military application articulated tractor , covered under p/n R50390 , or R502011, the inner diameter is around 5 1/2 the outer rim is around 7 1/4 inch , nice new gasket for repair of leak fix, buyer to pay calculated shipping and packing to your locations, see our store for more items like this one, thank you RWK.