Bumble-b,
I've looked at your website but cannot see any variation in the colours on offer (and widths?) for your plastic frame converters. I bought some black Hoffman conversion jobs that go over the top of the frame and down the sides but found that they didn't take up as much of the width of the metal runner in the box as I wanted, so I have since used wide end spacers that clip over the lug. Six of them interspersed with no spacers, fills the box to perfection and allows me to vary the spacers if I wish to make the bees draw the comb even wider than normal, thereby enabling the bees to store more honey. I haven't actually tried that but the option is there. I am not trying to be smart or put you down in any way at all but would appreciate your comments please.