For a variety of reasons good matching sets of curly koa binding is hard to come buy. When I cut koa I'm cutting for sets not bindings. If you're lucky, bindings can be a by product of cutting sets. But to get contrasting colors your tactic needs to be a little different. Try to locate some "sticks", 2 X 2 material or similar and rip it yourself. Any time I run across and extremely consistently curly stick I'm thinking about bindings and put it aside.
There's a reason I charge so much more for curly koa binding.
BTW, dying koa is a sin.....