Entry/landing brick to use?

As I really sink myself into this build I have a question about the entry/landing of the oven. Does the landing arch have to be built with fire brick or would a good quality old red brick be okay? I don't know what kind of heat that entry/chimney area has to take so I wasn't sure if I'd be sorry I used a red brick there or not. Some pictures I am finding look like they are just using a red clay brick, or perhaps it is just a facing over the fire brick?

I'm in the process of laying it out, getting my dimensions right (picturing it all in my head) and then plan to really jump in this next week - weather forecast looks perfect! Any thread you recall that deals with this question, I'd love a link...or opinion, advice, thoughts? Thanks!

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