So, I have the 11.75” skillet and found this Le Creuset lid on Amazon (link below) that fits perfectly. Unfortunately 12” is the largest I found. You may want to consider a wooden wok lid. They are also available on Amazon and will not damage the enamel. Best of luck!

Le Creuset Signature Glass Lid with Stainless Steel Knob, 12" https://www.amazon.com/dp/B079MN5Q43/ref=cm_sw_r_cp_api_glc_fabc_Vy.8FbWS4W415?_encoding=UTF8&psc=1

Forart Wooden Lid for Cast Iron Wok with Wooden Lid 12.6/13.4/13.8/15 Inch Diameter and Large Handles https://www.amazon.com/dp/B07ZM7YVBJ/ref=cm_sw_r_cp_api_glc_fabc_LT.8FbSQXZCRA