The dish, in or out ???
And why were they dished in the first place ??
Dish against the firewall. These large cupped washers provide full support for the strap threaded end, lots of weight with a full tank of 9 gal. gasoline! Cupped washer prevents cowl flex or bending and cracking.
Thanks Dan, that's the way I finally installed it. Black book had a small pic , with readers it looked that way.
Funny, the Book calls them spacers.