|From an email
I was in the automotive section of my "LWS"
(Local Wal-mart Store) and I came across the reflective strips you see
many times on the sides of semi-tractor/trailers.
Like SideLights, these are thin, "single-layer" microprism
type reflectors. About 1.25 inches wide and about 16 inches long. One
end is red, the other white.
They'll have to be cut to size, of course. But they should work
fine. AND I have two colors to choose from, so i can use the reds
on the back wheel if I wish.