Need help finding replacement casement window track and slider

We have two identical casement windows (Milgard I believe). One of them is missing its track and the slider may be damaged. So we are looking for what might work as a replacement for both the slider and track. I'm including pictures of the functioning window and the broken one. The track on the functioning one is 14.5 inches long. Do you know where I could find these, or will the roto track (39-542) and roto slider (39-541) on your website be comparable enough to work as a replacement? Thank you.