Finding correct adaptor for radiator valves

MattAlt73

Apologies for a newbie’s simple question but what adapter should fit this type of radiator valve?

https://photos.app.goo.gl/KtYiDfSBZwqZf3iF8

johnnyp78

Have you tried the adaptors that come with the trv?

MattAlt73

Yes, but I can’t figure it out hence the question