Need milgard scissor-style operators
Thanks for reaching out to us! This window operator appears to be the 39-239B Encore Awning Operator (the stainless steel version is the 39-239C). While I am confident this is the correct replacement, be sure to double check the dimensions and design.
This operator is sold with the compatible clips but the pieces that slide in the track, attached to the end of the arms, are sold separately. You'll need the 39-536 Truth Hardware Pivot Slide Assembly to replace them. It is compatible with the 39-556 Maxim Awning Stainless Steel Track.
The compatible cover and handle kits are the 39-375 (folding) or 39-451.
The stainless steel material should hold up better against conditions that cause rust and erosion but it cannot prevent it 100%. It is suggested to use especially in coastal areas with high humidity.
I hope this helps!
Please let me know if you have any additional questions.