Was looking on your site at the manifold insulators and was wondering what's the difference from vs/vt to vx/vy insulators?
The main difference between the two is the PCV valve port/channel. As a result if you attempt to install a VS/VT manifold insulator on VX/VY ecotec manifold, you'll end up with a massive vacuum leak.
However you can install a VX/VY manifold insulator on a VS/VX ecotec manifold, though installing it on a VS would require a section of the insulator to be trimmed to make room for the billet fuel rail on the passenger side
If you have any questions please don't hesitate to ask
Kindest Regards,
Steve