You can get a roll film back that'll fit, that's the easiest option, just watch the edge types differ and don't get a 620 version, they are usually cheap.
The model number maybe wrong I think, Zeiss made 9x12 and 1/4 plate cameras, 1/4 plate were for export only as it was never a Continental European size. Both 1/4 plate & 9x12 film are available, there's not much choice in 1/4 plate but a wider choice if it's 9x12 as it was the Continental European equivalent of 5"x4".
Ian