Karl, these pictures were taken in 191
9, not 1916! It's really not surprising the text doesn't mention Resta at Tacoma in 1916 because he did not race there in 1916! But thanks for the mechanic's name!

Robert, I have checked again against another EX5 (Boillot/Lyon), and the rear of the frame looks identical. The Wilcox EX5 was different, however, the frame did not reach that low. : Also, those cross tubes, while I'm sure they were there, are not visible on any other EX5 I've seen! You're right about the mounting of the rear spring, but the 1916 Sunbeam had exactly the same arrangement. : :
The side aperture can't have been too useful - I know that the Burman-Peugeot had a new engine built by Miller with a single Miller carb, and the old Peugeot rebuilt with two Millers (see respective pictures in Mark Dees, "Miller Dynasty", p31 and Gordon White, "Offenhauser", p14), but I have never seen it with two apertures.
dbw, I believe most Peugeots in the USofA went to Miller's shop at one time or another, probably all. And yes, the track surface is very scary! 2x4 laid on edge, but unlike other board tracks not smoothly against each other, but in order to save lumber spaced at about 3/8 inches, and the space filled with crushed stone and tar! Drivers likened the ride on the Tacoma boards to a ride through a meteor shower!!!