I had the IRD Vortex cranks (they were quite similar!),
sold them a while ago :cry: .
This is what Joe B. had to say about it:
Hello Sandro,
Both Vortex models were designed by me. I essentially sold the rights to make them to InterLoc.
The original Vortex cranks had a round, tapered cross-section and a machined spider. The later version had a cross-section that was more square and an investment-cast spider. Both are made of chrome-moly steel.
So with that knowledge, if anyone has vortex cranks they're willing to part with (preferably the early type, but beggars can't be choosers) they would be a very close second choice to the genuine Breezer ones.