[php-maint] Bug#513204: downgrade to patch not working...

[Noel T.]

$ apt-get -s install libmysqlclient15off=5.0.51a-24lenny1
Reading package lists... Done
Building dependency tree
Reading state information... Done
E: Version '5.0.51a-24lenny1' for 'libmysqlclient15off' was not found

Do I need to add a repo source?  I have the default set:

$ cat /etc/apt/sources.list
# deb http://mirrors.kernel.org/debian/ lenny main

deb http://mirrors.kernel.org/debian/ lenny main non-free
deb-src http://mirrors.kernel.org/debian/ lenny main

deb http://security.debian.org/ lenny/updates main non-free
deb-src http://security.debian.org/ lenny/updates main

deb http://volatile.debian.org/debian-volatile lenny/volatile main
deb-src http://volatile.debian.org/debian-volatile lenny/volatile main

I wanted to see if this worked for me but unsure of how to proceed.