As odd as it may sound, Crow River Trading, many times has some odd EM parts that are not available from other sources like Steve Young.
Specialization in many hard to find early coin operated parts like weird springs.
Their pinball book collection is one of the finest on the internet, but you have to move really fast on the rare books when they pop up for sale.

http://www.crowriver.com/coinop/index.htm

Pinball Rescue is not down and out.
These decals were not "lost".
"Anything is possible", sources are available, go find them.
Beyond that I am not breaching this topic further as there is already too much a$$clownery going on in the parts world.

The same people that worked with Terry at Pinball Life that created the original Stern "real knocker" kit.
You might remember them, they do a lot of other pinball specialization for "one runs".
For the life of me, I cannot remember names right now.