Your mirrors should be Valvac since that is what National used. Valvac may not show them because National installed them inverted. If you don't see them on the Valvac web site give them a call. This is the style my Dolphin has with the top hat mirror only it is installed inverted. Item Number 716208, V-max LEM 2025 Base On Velvac, Inc.
Here is a drawing of the mirror without the top hat ours use the 2025 arm mount inverted. They use to show the National mirrors on the web site but don't now. You just need to call them.
Chuck & Teri, 1999 35 ft. Dolphin 5350, F53 Chassis with tag axle, Chassis build date 1/99 in Mexico, Banks System, Trans Command, Air Lift Air Bags on rear, Koni Shocks, Blue OX TruCenter, TigerTrak track bars front and rear, Roadmaster 1-3/4" rear auxiliary sway bar, 2013 VW Passat TDI SEL Premium, 1994 36 ft. Avion 5th Wheel. FMCA #F430129