Most shops in TO would have an account with Babac. They offer something similar for 31.8 and 34.9 tubes.
http://cyclebabac.com/product/double-casing-stopper/
I have a Babac account if nobody near you can help. (I'm in Oakville)
There is also these if you are OK with running full length housing and your tube diameter is either 28.6 or 31.8.
http://cyclebabac.com/product/clipattache-3pcsbag/
I've used them on a number of builds, and they work just fine.