Having had a '63 four door custom, I would leave the trim in place.  I
had actually toyed with the idea of removing these pieces permanently
but I never got around to finishing that project.

Yep. Unless there is rust growing out from behind that trim, it is best
to leave it alone and mask carefully.

Herman Thoms of The Thoms Brothers at Studebakers West, regular Turning
Wheels advertisers, can fix you up with a repro wiring harness made to
order.

New black dash "pads" are not available, but I understand green ones
ARE. Just dye a green one black.

Seat upholstery is readily available from Phantom Auto Works, or maybe
a little cheaper but not quite as faithful a reproduction, from John
Poulos here on the forum. (Hopefully, JP will not shoot me for that
observation, but not everybody can afford premium stuff and it is nice
to have quite usable new material available for a lot less money).

Black vinyl with white vinyl inserts was available (Order Code 712BKV
for 1963 Custom 2-DR) and may have even been more common than all black
(Order Code 7121BKV), as the car is now. Either arrangement is
"correct" as to authenticity, if that is of concern to you.

Those were nice cars, and an R2/4-speed is really desirable. Congrats
on seriously tackling one. Bob Palma

Try SASCO for the harness, they had the one for my 62 ragtop NOS.

Jim Turner

  I have the exact same car. I removed the stainless around the doors
window frame. When it came time to re-install them I used Kit Car wax
on the newly painted window frame and was able to re-install the
stainless without any problem. The wax helped the stainless molding to
slide around the frame I did however put 2 dents in 1 window molding on
the driver side. This was on the horizontal top molding that goes over
the 2 vertical ones.That was just before I tried the wax idea. I wish I
had thought of that in the 1st place,there would be no dents in any of
them. You could probably use WD-40, vaseline whatever.
    My biggest problem with the car at the moment is wheel hop and
trying to get the supercharger belt to stop slipping. I have a black
dash pad from Studebaker international that I will be installing before
next season. I used The Historic Automotive seat covers,J.C.Whitney
carpets and their headliner as well. My car is a driver and is not
intended to be a show car. It is quite presentable as it is.I need to
re-do the headliner again.Last winter I had mice staying in the car and
they made a meal of my headliner. I want to get the next one in
black,this way the entire interior will be black.Maybe someday I'll
re-do the interior with the correct seat covers and door panels from
Phantom. I am using cheaper Lark Standard door panels that I dyed
black. It is not unusual for me to have my large[95 lbs] dog in the car
or my son and his friends. I can't see spending big bucks on the
interior and then getting all cranked up if someone does something
stupid to it. I'd rather drive the hell out of it and have some fun and
make some memories in it. It can always been done over again. Good luck
with your project.  Joe Flannery