Does anyone know the best source for the 'angle arms' for a 1987 300sdl sunroof ?

Are these ever installed 'used' with success ?

What model/year should interchange ?

Any details on the 'sunroof upgrade' ? What parts are 'extra' or upgraded ? I'm pretty sure that my sdl has not had sunroof upgrades.

FYI, switch works, motor runs, sunroof does not open at all. The last time it worked, the sunroof flipped up and stuck. I'm pretty sure that the angle arm on the passenger side was broken. It was cool and raining, so I manipulated the sunroof shut and left it alone. Now I'd like to get it working again. I'd just like to make sure that I have some info going in regarding parts. Thanks !