On my 81 vanagon with the swivel seat the metal plate and the track stay on
the van if you remove the track from the original seat the whole metal bottom
and have this welded to your replacement seat then you can do every thing out
side then no inside cutting or welding. Where i led people astray by my email
reply was that on the type 2 74-76 by removing 4 nuts on the metal disk the
whole sliding track come off so i destroyed the old set escept for the bottom and
had this welded on the replacement seat. Sorry for the wrong info