That's a problem I'm trying to solve myself. The only takeoffs that are long enough are those in that expensive Dubro set, "Heavy Duty", and they are about 5/8" long, plenty of length to let you drill a clevis pin hole wherever needed.

Unfortunately, I've not been able to find just the takeoffs - YET. But I'm looking pretty hard...we have to think outside RC, or at least outside "control stuff"; I'd bet there is something out there already that would be perfect. We just haven't found it.