To the OP,
replacing an RV screen (the screen part) is the same as replacing a torn screen, but you need the screen's frame. Start here:
http://www.holidayrambler.com/holidayrambler/contactMaybe they can tell you what other RVs in their product line use the same window, or the make/model of the window - if it is common to the RV industry. If they don't have a screen and frame for your RV to sell to you then maybe they can give you the information to source a screen (on frame) from a dealer or a used RV parts supplier.
Contact/Scheduling
Service, Parts & Warranty Information
•Technical Support, Parts and Warranty Assistance: (877) 466-6226 (Toll-free)
•To schedule a factory service appointment at either Oregon or Indiana call 877-466-6226
•LOCATIONS:
Oregon Service Center
91320 Coburg Industrial Way
Coburg, OR 97408
Phone: 877-466-6226
Fax: 541-335-8351
Email: ORservice@monacorv.com
Indiana Service Center
76 Ward Street
Wakarusa, IN 46573
Toll Free: 877-466-6226
Phone: 574-862-7263