Tiltable LED fire rated downlight (Sciennes EH9)

I bought this to replace a dead light but it's too small. Missed the window for return, still boxed with instructions. Says 72mm cut out, 88mm diameter on the website.

This links to the item: https://www.screwfix.com/p/lap-chaac-tilt-fire-rated-led-downlight-white-5-...