pinning ssh to whatever is current in stable?

[Anonymous <cripto@ecn.org>]

On a Debian testing system I want to pin the ssh package only to
whatever is the current version from the stable repository.

I've read the APT HOWTO and I think I want to put this stanza in 
/etc/apt/preferences:

Package: ssh
Pin: release a=stable,c=main,o=Debian,l=Debian
Pin-Priority: 1001

Is that correct? Can I get away with not stating "v=..."?

The file is now full of automatically generated stuff by
apt-listbugs. Will apt-listbugs retain my manually added stanza when
it rotates the preferences file? Do I add my stanza at the top or
bottom of the file or does it matter?

Thanks.