There was a discussion about what current Sun servers would run Solaris 8.
I found the following product note for the V125:

<http://docs.sun.com/source/819-7424-10/prodnotes.html>

It says:

Operating System

If you need to reinstall the operating system for the Sun Fire V125 server, you must use the minimum level of the Solaris Operating System and apply the latest version of required patches in the following list:

* Solaris 8 2/04
* Solaris 9 9/04
* Solaris 10 3/05

So it does not appear that a new release of Solaris is needed.
--
Jeff Wieland