For the regular type 705 (15x1) needle, I guess most of them should work. For the two needle clamp, the width between the needles are fixed, and it take time before you find one, if it's not with the machine. I have yet to find the double needle clamp for my Elna Supermatic. It hasn't been a problem yet, I have two different twin needles, and I haven't worn them out yet.
Here's a geneneral overview of the various kinds.