Lost PBS Kids "Letter Bus" Bumpers

From 1999-2009 PBS Kids made a series of bumpers called "Letter Bus" it features alphabet letters on a bus.

Found Bumpers

 * B
 * E
 * G

Lost Bumpers

 * A
 * C
 * F
 * H
 * I
 * J
 * K
 * L
 * M
 * N
 * O
 * P
 * Q
 * R
 * S
 * T
 * U
 * V
 * W
 * X
 * Y
 * Z