Here is a scan of the parts book showing cruise installation on a '63:
I thought the dial was in more detail, but it is not. It's too bad that housing was broken. Did you contact the seller? Seems it should have been packaged better. That regulator probably flopped around during shipping, busting the dial and housing. Seller seems to have good feedback, hopefully he'd come through for you.
As far as interchangability of the control head, parts book sez '61 and '62 are the same, '63 is different. I thought that might have been due to the bracket with the lamp housing, but that is a separate part, so I don't know what the difference is. I know I had one for a '67 and it was very similar, but a different part number also. Might have been the offset for the screws. Internal parts seemed identical. Bottom line is you can probably interchange these and make them work. These control heads were also used on Cadillacs. Fear not. We will get you a good control head somehow.
Did I miss anything? More to follow...
Paul