Just sharing a little head size-and-shape rapport:
I'm 7-5/8 long oval; would have tried on an Arai Signet XXL if available, but XL was the largest around. Fits snugly, but easy on, easy off, and--imbues some crash-protection confidence. I have also an Arai dirt-bike helmet, same size, but that model is NOT long oval--serviceable, but . . . wish it WERE long oval!
Please, excuse the distraction: My goal would be to help you sell your fully-excellent Citation skid lid, not to sell YOU an Arai!
Were I helmet-shopping right now, your helmet would be GONE! Best of luck in finding the headgear a new home.
“You better put down that gun. You got two ways to go, put it down or use it. Even if you tie me, you’re gonna be dead.” "John Russell" (Paul Newman), Hombre