Solid state regulator conversion confusion!

Didn't mean to post this one before after I realized what it was.
I'll put it here.
This looks like an original pre-70 with all the correct markings and parts surviving, but someone modified it to use insulated brush holder for a 70 up regulation system.
Looks like it was done years ago before anyone had interest in preserving originality.
upload_2020-9-3_11-31-19-png.png
I could be wrong about the modifcation - it could be some special purpose assembly. Chrysler did have some different systems - rare at the time and rare now. But I don't think that's what we are seeing here.

More often we see rebuilders who drill the other side for the insulated brush holder.
Like this one.
upload_2020-9-3_13-8-25.png

upload_2020-9-3_13-8-57.png

Boo :(