The items that fit your Honda Stepwgn (RG) are shown below.

The third generation "RG" Honda Stepwgn was built on an entirely new platform from the first two generations of "RF" Stepwgn, with a much more aerodynamic design and a lower floor. As before it was only released for the Japanese domestic market and came with a standard double DIN sized radio as standard so no new fascia is needed to install a double DIN.