Magnepan Crossovers: Who makes them?

There's a lot of DIY info on crossovers from Magneplanar speakers, like the Magnepan 3.6r. But does anyone make them and sell them as completed kits?
mostly if you are looking for pre-built, going with a Marchand X44 (or tubed x26/x126) or a Bryston or Behringer.
I'm pretty sure that I saw a pair of crossovers that Chris Johnson from Parts Connextion had made for someone. These weren't kits. I would suggest contacting Chris and inquire about them.

That is one of the pre-made solutions that I have seen get some favorable reviews, it is a bit pricey though.