It looks like this Part has been superseded by LEGO Part 60581 Panel 1 x 4 x 3 [Side Supports / Hollow Studs].
Click on a colored part below to see the Sets and MOCs that use part 4215b Panel 1 x 4 x 3 [Hollow Studs] in that color. You can find an overview of all LEGO Colors here.
If a color is missing, it probably needs to be added to a Set Inventory.
This part has been used by MOCs in the following colors but not officially released.
There are 4 Mold variations of part 4215b - Panel 1 x 4 x 3 [Hollow Studs] in the database, in use between 1994 to 2016. See Molds and other related Parts.