I saw these on a German Eriba FB site, they are cabinet straps to go avoid the door swinging down and ripping out the hinges.https://www.svb24.com/en/bavaria-plastic-flap-holder.html
I got these from a UK Ebay seller last year. Brilliant.Stewart
if my memory serves me correctly he is based in Kirby Stephen Cumbria
You could try these:- Werbung: https://www.ebay.co.uk/itm/303037195289Colin
That's the chap. Stewart