I just ordered my RV-8 wing kit and looked into this. . I'm going with the Newton Aero (sold by Spruce) with the curved flange to match the airfoil shape. You have to build the tank with their flanges. The other option are the "Retro fit" caps from Andair, also sold by Spruce. They can go into prebuilt tanks by prosealing in a sleeve adapter. May be other options, but that's what I found. I think Vans used to sell the Newton Aero as their "Deluxe" cap, but I don't believe they do that anymore.
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Tom
Las Vegas
RV-8 empenage almost finished
Horizontal Stab done! 2-15-2020
Vertical Stab Done! 5-27-2020
Rudder Done! 5-31-2020
Wings ordered!...
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