I purchased two of the cymbal mounts linked on the first page:
SP boom clamp
SP Micro Cymbal arm
A couple general notes about them:
The micro arm is just that: Small. I don't have the Ion rack, but I'm not sure how well it will work with it. You only get 6" of clearance, if that, between the bottom center of the cymbal and the rack arm it's mounted to. Also, you might - might - be able to get 8" between the center of the cymbal and the center of the rack arm. I don't know how well that will work when you have a pad mounted on the same arm. The 1-1/2" tube does fit in the clamp, but with very little room to spare.
The boom clamp mounts to an upright post only. The boom arm is nice and long, placement shouldn't be an issue with this.
Both of these will slightly abrade the paint on your rack. They are "real" cymbal mounts, after all, made of metal, not sissy plastic like the Ion crap.
Both pieces, though not "brand-name," are solidly constructed. Your Ion rack will break before these things will.
I can recommend the boom clamp without hesitation. YMMV with the micro arm, though.
Note: I have Pintech PC 14" cymbals.