Re: Mitchell OD in ‘30 Phaeton?
Yes, one of our club members has a '30 phaeton with a Mitchell O/D.
Best bet for fitment is to call Steve Mitchell directly with your question. He makes several different combinations of input/output shaft length, he can advise you on what fits what car.
The "typical" configuration will not fit slant windows. The special slant window configuration will fit anything except (I believe) Victorias and A400. I've not heard of any particular fitment issues with phaetons. But call Steve to confirm.
Of course, if you or someone else has fitted an additional lower storage compartment then he'd need the dimensions of that to determine which unit to spec. I have heard of folks adding a recessed box under the rear seat. Seems to me there was an article in one of the national club magazines about that a few years ago.