get the d street axle
make/have made custom axle with threads or extended 14mm thred for nut and peg mounting
or do what i did and drill out one side and grind the head flat, run a piece of hardened steel through the axle. put nuts and washers on each side and tighten down with pegs.
pegs on mtn bikes are pretty lame. i ended up never using them, getting hurt by them constantly, was made fun of, and looked like a homo for the 2 weeks i ran them
FYI, you can grind on your pedals. I took my pegs off years ago and it worked out for me pretty good. If you only ride parks or smooth ledges, even better, but even rails can be done. Anyway, just a thought and keep you looking hetero.