I tried the flange rollers but I had a problem with them when I wanted to use full spools so I went back to using the rollers I made for another dry box. They should work with most spools under 74mm in width.

For the rod holders scale it up or down a bit depending how they fit for you, they should sit snug so they don't fall out.

It holds 6 spools and you need:

No supports needed