I have Starfire 58cc GenII ,with a Blown crank seal. Numbers on seal say 17 x 29 x 3.8 , but all I can find on the linked websites is a different seal, measurements 14.8 x 27 x 3.8 so I ordered one from Piston Bikes and it's about a 1/8" smaller in diameter! Where can I find one that will fit my Star fire?