The ones that I have are by KTS of Japan made, I assume, when the Scenicruiser was new.
They are about ½" short (14 ½" instead of 15") and a little tall, but they look the part and a lot less work than trying to make one, which I was trying to do.
Watch out though, KTS made several different sizes of scenicruiser.
These are not in the best of shape and I found them at a good price, but you will see them on eBay for anything from $100 - $500!
David Leech, Delta, Canada