Repair kits
The pix shown are really bad conversions...
However, I do remember in about 1981,2,3,4 etc, Magnavox did offer a replacement changer "kit" which consisted of a BSR or BSR-LIKE changer and a mounting board. Since the Collaro changers were dying, people were getting their fancy console units fixed with this kit.
The kit sold well. I remember a bunch of Magnavox getting these kits. You could throw the kit into anything and I remember at least one Admiral getting a new changer. I also remember the stereo tech being rather lazy and preferred to drop in a changer rather than repairing it. Not-so-surprisingly, Zenith and VM changers always got fixed and never needed a new changer. Not that VM changers were better (Collaros were very well made as we all know) - it's that Collaro parts (and Admiral-made changer parts) were getting scarce at that point.... any some techs were getting really lazy at that point. IMHO