Here's the full ISO for 8.1:
And then you can add the repos to update to 8.3:
Or you can take the small ("boot") ISO and install 8.3 directy:
In fact, they are even building Springdale Linux 8 for i386, which RHEL and CentOS never did.
If you need more than three years on openSUSE Leap, then you need to upgrade to SUSE Linux Enterprise Server.