no other gbody , only regal 81-87 and this is parts for sale section not general tech
the part #s are call gbodyparts.com and order the fiberglass fillers
having the gm part #s (L ..20428396 / R.. 20428397) wont help as they are and have been DISCONTINUED , the few gm parts that some have stored away and decide to part with are going for 1K+ a pair and really shouldnt be considered a bad price as they are discontinued and before going discontinued they werent cheap from GM listing over 500each and available at around 350ea if you could get them at dealer price
so they should sell it to you for less because you think that their price is too much even though thats about what gm had them listed at 5 years ago ..be for real
smoke20 had a few sets a few years back (right about the time you signed up for this board) , he wanted more than some thought they were worth , cheap by some of todays price , he might still have them tucked away