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Hey, If you get this right away let me know what colour you want and I'll get them on order before I leave the office. They usually deliver within a few days. I just got an infared from them and it was really fast getting here.
Yes fire bricks will do and yes to the link on copper elbows. When baking or doing pizza the higher in the dome the better. Make sure the thermometer doesn't hit anything high in the dome, you could bent the thermometer and if it is touching anything the temp is not correct.