Trilux springs

I have acquired a Trilux L2A2 sight unit or "SUIT". I plan to use it on an Aussie L1A1 build I'm doing. I would like to get some new springs for it. I was wondering if anyone here knew of a source.

I would also like to get the screw that goes through the lever to secure it. I notice that a lot of SUITs don't have this feature.

That's because its actually an Israeli SUIT!
The mods they did included the screw you mention, a different style "figure-8" main spring, instead of the Brit "zig-zag" one & a coil spring & "latch underneath inside the bottom casting.
It may have been also changed to an English type label, as many were?