I love my Kenmore 158.850! And my 158.540! And my 158.880! And my ... well, you get the picture. I'm up to a mere six. I am neither a hoarder nor an addict. I am an enthusiast!
As to finding cams, the 158.850 takes style E which I believe came with # 1-7. The full set of 14 came with the 158.540. Other models also use this set of cams but I don't recall the details. They aren't always labeled well and # 1 - the basic zigzag, is generally missing as it is often left in the machine and becomes separated from the set. I can post pictures of the cams if that would assist in your search. Just let me know.