Dial/movement question 1665

[dieselpower]

Whilst I'm in watch mode I was wondering if an expert could help me with something I don't get. (One of the many things!). If I were to take say an old school MBW 1665 and buy myself a gen movement, would I need to change the dial aswell as the hands? I understand that eta hands won't fit a rolex movement and that makes perfect sense but I was wondering about the datewheel window? Surely the window on a dial made for an ETA movement is not in exactly the same position and the same size as the one on a gen dial? Which then prompts the question, if you wanted to fit a gen movement (assuming that's possible) what dial do you use if you don't have a gen to hand? Thanks oh great ones 

[cib0rgman]

I have a 1665 with a gen movement on it and the only issue with the MBW dial the date window is a little bit off, since I am really picky I switched for an Ingods rail dial and I am very happy, If you need a dial let me know this one has been Aged by The Zigmeister.

 

Regards

[freddy333]

I have a gen movement & handset in my double-red & all I had to do was reshape the calendar ring to allow the movement to sit flush with the dial opening in the MBW case. I believe some others changed the calendar ring, but I do not know which ring they used?

I sourced a dial made to fit the 1575 on ebay (cannot remember who the seller was), but my guess is that the date window in an MBW dial, as cib0rgman suggests, will be slightly off if used on a 1575 movement.