The old sar-File will never be deleted:

+find SA_DIR \( -name 'sar.??' -o -name 'sa.??' \) -mtime +"${HISTORY}" -exec rm -f {} \;

The sar-Files under /var/log/sa will be created as sa(r).yyyy>_mm_dd  The find command should therefore be written as:

+find SA_DIR \( -name 'sar.????_??_??' -o -name 'sa.????_??_??' \) -mtime +"${HISTORY}" -exec rm -f {} \;


An additional suggestion:
A configuration File (etc/sysconfig/sysstat) will be sourced in /usr/lib/sa/sa2.  This configuration File should be integrated into the rpm-package.