I have included photographs and a video to show how they work as well as a photograph to show the gap to which the window is left open. They are made from TPU which is a flexible plastic which allows the stay to fit tightly around the window latch.
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0.8/1/1.27/1.97/2.54Cm 12Yards Ultra Hold Tape Double Side Tape Lace Front Tape Hold Waterproof High Quality Hair Tape Wig Tape
Aliexpress UK
Designed and manufactured in the UK. AMT Window Locks and Top Hinges fit both left and right hand. AMT Window Locks and Stay Hinges are manufactured by us in the UK. Simple to fit, attractive light grain finish and very strong.
eBay
3yard/12yards/36yars Ultra Hold Hair System Tape Double Sided Adhesive Tape For Hair Extension Toupee Wig White Tape Strong Hold
Aliexpress UK
This is our window fixing kit, manufactured by us as Polyplastic no longer include these parts with their window stays. The kit includes 2 fixing blocks 45mm long x 15mm wide with 20mm hole centres.
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Wig Installation Kit Wig Adhesive Hold Lace Glue for glue for lace front waterproof Wigs Extreme Hold Hair Replacement Adhesive
Aliexpress UK
Pair of window stays. Slide on lever type - Image 7.
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3yard/12yards/36yars Ultra Hold Hair System Tape Double Sided Adhesive Tape For Hair Extension Toupee Wig White Tape Strong Hold
Aliexpress UK
They are designed to fit the very common catches made by PolyPlastic. I do have designs for other windows and, where possible, I am happy to create new designs. See the photos to see how they fit, which is between the window handle at one end and the fixed catch at the other.
eBay
Strong Hold Waterproof Wig Glue Lace Glue Pen Invisible Hair Replacement Glue Strong Hold Adhesive For Toupee Hairpiece Frontal
Aliexpress UK
This type screws onto the window and is not the slide on type.
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50A/120A FOR Plug Flush Mount Bracket Panel Bracket With Cover For Caravan Automobile Ships Part Replcement Accessories
Aliexpress UK
2Pcs window stay lock. Now you can repair your broken window stays. No need to buy a pair of stays. It is very simple to fit.
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2 Barrel New Carburetor Weber DFEV 32/36 Carb For VW Bug Dodge Caravan Challenger Mazda B2600 2.0L 2.6L Engine Fiat 124/131
Aliexpress UK
1/2/5/10pcs window stay lock. Now you can repair your broken window stays. No need to buy a pair of stays. It is very simple to fit.
eBay
1/2PCS For John Guest 12mm Push Fit Shut Off Valve StopTap Caravan Motorhome Boat Campervan Camper Accessories Replacement Part
Aliexpress UK