Any dial size 28,5 / 29 mm wil fit, but you'd have to cut the feet and either relocate them or simply use dial dots to stick the dial to the movement.
If you take a look at f.e. Raffles Time, he's got various dials in this size (normally a drop in for ETA2824 or DG2813), but at least you've got a lot of choise.
Take a look at the specs at miyota
8215 http://www.citizen.co.jp/miyota_mvt/..._8215_821A.pdf
9015 http://www.citizen.co.jp/miyota_mvt/.../draw_9015.pdf