I bought the cheapest MacSafe from China and fit perfectly

The aliexpress link isn't working. What size magnet was it?
@JonDotG_731062 its standard MagSafe magnets on the blue tape, like these https://www.aliexpress.com/item/1005006521276078.html?spm=a2g0n.productlist.0.0.81ef12349kBd8K&browser_id=178f5d32042d4ae8b4a5cf5e410decd8&aff_platform=msite&m_page_id=pdxzhxryveycavlj192a21e20f2178abebca112eec&gclid=&pdp_npi=4%40dis%21DKK%2158.43%2146.74%21%21%218.50%216.80%21%40211b812f17292967364902727ea26d%2112000037516982082%21sea%21DK%21133202081%21X&algo_pvid=370883b0-2c22-46be-a6e9-f8fc32d34d19&_universallink=1&m_page_id=pdxzhxryveycavlj192a21e20f2178abebca112eec
Very simple design, but works. I had to scale it a little bit