Baseplate Raised 8 x 18 with Garage Floor Plate with Octagon Holes for Automatic Doors

Reference

820a

Baseplate Raised 8 x 18 with Garage Floor Plate with Octagon Holes for Automatic Doors (part 820a) is a LEGO element. CollectORbuild's catalog records it in 1 set, including Garage with Automatic Doors.