So I just bought two levels of an ARS rack for my mice (ARS-1050) and wanted to put them on top of my ARS rat breeding rack (ARS-5032) but they didn't make a transition level. So for the last few days I've been racking my brain trying to come up with how to connect these two and this is what I came up with. I didn't have the exact color paint so I went a bit darker, you can see my handiwork, it has the dark paint. I think it came out much better than I was expecting! So now I'll have 20 tubs for rats and 10 tubs for mice.