Front vents support with holes to attach 3.5inch speakers, for a life size R2 unit this makes .Check the measurements to see if it fits your unit. This was drafted by me based on the files from the Astromecht.net forum. This is not a canon part but helps with the assembly.It is meant to hold the back side of the vents (3dprinted ones or aluminum) you will have to glue them to the support.