I solved the unsightly and empty look of the graphics card by designing this cover. You can find the design of the other ventilation opening on my profile.

I designed this because the strollers wheels were dirtying the back of the seat in the trunk. You can attach it using Velcro strips.

While vacuuming the house with my Viomi a9 cordless upright vacuum cleaner, strange noises started coming from the roller, usually caused by dropping or hitting the vacuum head too hard. When I opened it up, I encountered this problem, and after several unsuccessful attempts at fixing it, I finally found a solution. You don't need to glue it; it rotates freely inside now and there's no problem. You could also glue it, but I can't guarantee it since I haven't tried it.