Hopefully this will help someone in the future: these do not work at all with the Vortex PBT keycaps. I tried to use these with the Cherry profile caps, so perhaps the OEM will work better. As soon as I started putting keycaps back on, they all stuck up against the changers. I was really disappointed in the fit of each changer as well. They were horribly inconsistent. Some would fit with the switch just fine and others seemed a bit too big or small.
codesamuraiIn the last drop, a buyer had mentioned filing down the plastic with sandpaper for more keycap clearance. You might try that if you're not already at your wit's end.
jontheperryPotentially...I was using Cherry profile caps, so maybe OEM caps will work a bit better?
One of the other issues I was running into was how inconsistently each color changer was made. Some would fit snugly into the switch (like it was supposed to) and others were just a bit too big or small. I suppose if you had enough of them, you could file down the ones that fit the switches to also fit with the keycaps. I wish you luck!