Replacement crank for small bathroom window

i have 2 bathroom windows (approx 28w x 18h) that i removed the cranks from, due to rust (they were frozen and open 1-2" year round). My neighbor got parts from you for a similar window, but his dual arm crank looks smaller (39-140). I'm guessing i need the 21.5" size (39-083) to match the photo i sent?

The hinges on the side seem fine, and my crank handle seems fine.

I think i need the Window Sash Bracket too (39-170).

The Crank base has a Truth logo on the back, and a U.S. Pat. 4505601 on the bottom.

Am i looking at the right replacement part?

thank you,

Steve 

Thanks for the reply. The old piece is too rusted to close completely like the 39-083 photo, but it's very close to 21" as it is. Is there a part that is slightly larger or is this the best option?
Can I send a different photo?