I've seen this version. The extra fottage comprises mostly of a close up of Fonda's face while taking a HUGE crap. Morricone's music for it is BEAUTIFUL! Would've won an oscar if the scene wasn't cut.
WRONG! It was actually Cheyenne taking a dump while riding on Morton's train. Just before saving Harmonica, he had some other business to attend to...

I'm pretty sure he didn't bother to wipe. That's just a rumor.