I replaced my hog troughs about 6 yrs ago on '63R1498 and this is how I
was able to get to the pop rivets and the roll bar. First of all I
"chiseled" the firbeglass out from the top of the rocker panels and
drilled them out. Then I cut (with a hack saw) from the front of the
rear wheel-well opening (approx 8" up) fwd to the door opening and then
down and around the rocker panel (about 3/4" to 1" below the top of the
rocker panel). Then fwd to the front of the door. Save these pieces as
they can be re-installed with a butt joint when the new hog-trough is
installed. As for the roll bar, once the cuts to the body panels are
made, this will "expose" a "box" inside and aft of the door opening.
This "houses" the roll bar. I cut a square opening in the back part of
this box down low near the hog trough. Once this hole is cut you can
then access the roll bar bolts at the hog-trough. The fwd inboard
fastener you may have to access thru the "rear ashtray housing" with a
socket and a long extension. If you install hog troughs (I bought mine
from George Demetirus (sp?) at Olympius in Chicago) I suggest you
"chase" all the threaded holes as this makes re-assembly much easier.
Once the hog trough is installed, the roll bar can be bolted to it thru
this box and is really quite easy. - Note - I sprayed inside my new hog
troughs with aerosol "rubberized undercoating" for the obvious corrosion
factor and also to eliminate any "low freq vibration or tininess(sp?)"
from the hog trough prior to installation. After everything was buttoned
up. I applied the same undercoating to the outside of the "troughs" - I
suspect that if the original hog troughs lasted 30 yrs, these should
last at leat 60 years due to occasional driving, garage storage and very
little to no driving in rain and absolutly no driving in the winter (I
live in Minnesota).   

Hope this helps and good luck.

rgds,

Ron Maracle '63R1498