What is the size of the Wista 45DX back opening?

[Bill_1856]

I'd like to use my 5x7 extension back, and need to know the size of the opening.136022

[Bill_1856]

The camera shown is a Nagaoka.

[Fotocat]

Bill,
On my camera the wooden camera body opening is 15.4 cm. square, and the black bellows opening is 12.5 cm. square. Hope this helps.
CT

[Bill_1856]

Thanks, CT, I had begun to despair of getting any information, which is unusual for this forum.