INSIDE FRONT COVER
Inside front cover: Pen and Ink piece by George Tuska and Bob McLeod.
INSIDE BACK COVER
Inside back cover: Upper Left: Pen and Ink test for the Doctor Strange 1979 Fireside Book by John Romita Sr. Upper Right: Batman and Doctor Strange by Kevin Nowlan. Below: Illustration by Charles Vess.
I always use the original back cover on the customs.