Where is Heather when you need her? She could have this resolved
Maybe true: searching all parts in the DB by colour=red might track this piece down (it would be a big job!) something we users don't have the option to do. I tried several key words when I first got this part, things like 'rack' 'grid' 'holder', all to no avail.
However, there are thousands of parts not in PlaymoDB, waiting for us collectors and enthusiasts to track them down, describe and photograph them. And there are plenty which Heather has included, but the colour is unknown. I suspect this part may not be in the DB, coming from a pre-2000 set, so searching box pictures might be the best way of finding it.