Info on nest boxes

[Martian]

I have found so many nestboxes for my silver rabbit, but I am unsure as to if I should get a small one or a large one. Can anyone provide me links to cheap nestboxes that would be appropriate for a 5-6lb silver rabbit? Thanks!

 

[Martian]

also my hutch is 5' x 3' with a divider so I'd need to make sure itlll fit