Dear all, thanks for your help in advance.

We have an old house in San Francisco Richmond district, that was built in 1911. Recently we found that there are some missing roof tiles on our small roof, here are some photos:

(Note that some of these old roof tiles is crumbling and not in good shapes)

(this side of the roof tiles have recently been newly painted)

The size of these roof tiles are 1 feet by 1 feet. Does anyone know where I might be able to find such vintage roof tiles? I think the tile material is either porcelain or ceramic as they can crack.

Also, just in case that we can't find exactly the same type of roof tiles, does anyone know what would be alternative ways to get this repaired? Thoughts?

Thanks again for your help!