Optional black glass kit for the SimpliFire Allusion Heritage electric fireplace, offered in a 36" kit (SF-ALLH36-BGK) and a 42" kit (SF-ALLH42-BGK). It is an add-on that is sold separately from the fireplace and is not required to complete the installation. Choose the size that matches your Allusion Heritage fireplace. Special order. Follow the fireplace Installation Manual for installation details, and call us if you are unsure which size you need.