This might help.
Call Lippert customer service. See here
https://support.lci1.com/contact
I have called them before on buying parts for Krino windows. They will sell direct to you if they have the parts.
Lippert (LCI) bought both Hehr and Kinro and those two companies are still in business, just under the Lippert name.
What you may run into is, if Lippert stopped making the parts. I ran into this, this spring. They no longer make the style white Kinro windows we have in our Sunlines. And they discontinued some of the styles, like the crank out windows you are referring too.
But, they do offer black windows in other styles, just not a crank out. They either have a sliding vent panel or a tilt out. So if a window is totally broken, they will build a window to fit into the camper rough opening, just it may be black and have a sliding vent or a tilt out.
Hopefully the part you are after you can still get.
Hope this helps
John
PS. If you call, please let us know how you make out
__________________
Current Sunlines: 2004 T310SR, 2004 T1950, 2004 T2475, 2007 T2499, 2004 T317SR
Prior Sunlines: 2004 T2499 - Fern Blue
2005 Ford F350 Lariat, 6.8L V10 W/ 4.10 rear axle, CC, Short Bed, SRW. Reese HP trunnion bar hitch W/ HP DC
Google Custom Search For Sunline Owners Club