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

The Honda Stepwgn is produced for the Japanese domestic market. 

The earlier RF built between 1996 and 1999 had a standard single DIN sized slot with a fixed pocket below. These models will need modification to the dashboard to fit a double DIN radio.

Later models feature a standard double DIN slot, either with an original single DIN radio and a pocket or with a full sized double DIN originally fitted.