openbsd 3.7 ftp mirror

I follow the default installation instructions, but
there doesn't seem to exist an ftp mirror eith the
path /OpenBSD/3.7/hppa/, although  this is default.
Searching in some mirrors manually, i also didn't find
a place where i can download the 3.7 hppa binaries.
How can they be used as default paths and not exist?
I also tried to provide a path /OpenBSD/3.6/hppa/, but
i only saw these:
--------------------
The following sets are available. Enter a filename,
'all' to select
all the sets, or 'done'. You may de-select a set by
prepending a '-'
to its name.

        [X] bsd
        [X] bsd.rd
-------------------------
although in the same server and folder more packages
for the 3.6 distribution exist. I thought i could use
the 3.7 bootable cdrom and install the 3.6
distribution, because the only this this cdrom has
done so far is to setup the disks. Is this a wrong
idea? Why?
Thanks a lot. Any help appreciated!

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