Manufacturers don't list the parts that they use on their trailers so you'll need to measure the distance from the center of the port to center of the other port (pictured below) to determine the correct replacement.
For example the Lippert Replacement Hydraulic Cylinder for RV Slide-Out # LC342328 you were looking at has a 41" port to port measurement. view full answer...
LaSalle Bristol CrossBreeze Adjustable Toy Hauler Screen - 96" Wide Item # 3441409600PBK will fit the dimensions of your 2014 Forest River Vengeance TT Toy Hauler opening and prevent bugs from getting in. The unlimited stopping points let you customize your rear doorway by simply pulling the screen down to the desired stopping point and gently tugging the lanyard to get the screen to retract back into the housing. view full answer...