Install TSCAL (Windows 2003) with RDSCAL (Windows 2008)

Hi

We have a Windows 2003 server that's recently needed re-installing. Unfortunately no backup of the original TSCALs was made.

We've been unable to buy any replacement TSCAL licenses but was informed by a supplier that it's possible to install the TSCALs using RDSCALs for Windows 2008. Now, we purchased a 5 user 2008 CAL pack but when I try and install the license is alerted as invalid.

Could someone tell me if it is fact possible to install Terminal Services CALs using a Remote Desktop Win2008 CAL?

If not, does anyone know how I can get hold of these old Win 2003 TS CALs, they appear to be like gold dust at the moment.

Thanks for any advice.

Carl