ID for trans. unbreakable glass OR transparent solid object?

[Whiskey]

I know there have been several topics in regard to the ID of a one-sided (the other transparent) unbreakable glass; however, none of those who inquired about this object got an ID. I'm currently using MTA: San Andreas 1.1 and I've been looking almost everywhere for this object.

Also, if there isn't a one-sided unbreakable glass, anything else that's transparent and unbreakable would be wonderful, such as a wall. I'm currently constructing an interior and already chose the windows for the building. The windows are complete, however you're able to walk through them. I need something transparent and unbreakable to make these windows solid.

A free cookie to whoever finds the object I'm looking for!

Thanks guys!