I'll have a dig through the workshop later on. I might have a 42 toother somewhre.
Bonj will be along in a minute to say you can't have a square-taper fitting chainset. Must be splined. And hollow. And carbon. And have four arms. And have been invented within the last five minutes... Or something else that won't fit your bike!
Meanwhile, I'm curious. What are you building with it?