Guides look good myself I would not worry either way on the nut use the old one and stake it or since I enlarged the picture I see the new one came with thread locker on it. so your probably looking at a change they made. I think either one would work fine.
Wavey washer is on the back between the input shaft and the lifter piece as above. the front side is a thrust face for the needle bearing to ride on and then there should be a flat thrust washer in front so the bearing is rolling between two hardened surfaces and not ride on the aluminum pressure plate as they would Gaul it up.
Hope this helps.