There is no System 5 for Mac, there might be  System 4.5 but I do not have it. You can look at my (very old) site for some System Software that I have: http://members.tripod.com/elfen_magix/VMSsoftware.html

I no longer make bootable disks as I do not have a working old Mac to make them with.

Jag's House has from System 6 to System 8: http://www.jagshouse.com/macos.html

Jag Links to Apple for older System software but Apple has from System 6.03 on...: http://www.info.apple.com/support/oldersoftwarelist.html

The older software is out there online. You just need to find them. Hint: Make Google you friend.