Hello Stéphane,
Thank you for your support, the product is not suitable for your A20M printer, you can purchase this product, the product link is here: https://www.geeetech.com/titan-extruder-kit-for-a10m-a10t-a2-
0m-a20t-a30m-a30t-p-1131.html, sku is 700-001-1103.
If you need any help, you can contact me at this email: myorder@geeetech.com.