Save first background as background2-13 and second one as background2-32.
Don't worry about the cut-off in the second background, you won't see it in SMBX if you won't expand the level area. Also you must place some Statue Blocks at the bottom (because Mario will fall down).
Download link for those who can't see the images: http://www.mediafire.com/download/30vrttoenkecsdv/2 YI Backgrounds.zip
Enjoy





