IPA - Inner Piece Adapter

The Inner Piece Adapter is often attached to another adapter part
to provide the inner piece facing for attachment of an outer piece, offset link,
or spacer. It may be used independently for bolting onto a location with
two bolt holes spaced xx" center to center.

It is used as part of the Multi-hole Inner Piece Adapter, Multi-hole Round Tube
, Permobil Inner Piece Adapter, the Side Mount Inner Pieces and
custom inner pieces.