[Tristan Lall]

Martin makes them, but only in #40, #50, #60, #80, #100, #120 and #160. Tsubaki makes them, but again, only #40 and above, and for multi-strand chain only, unless #80 or larger are of any use (which they can't possibly be).

I assume that you want #25 or #35...so that's no help.