Reply to Chroma Caps on Vestax VCI-400

Hey guys and sorry for this forst post, because the answer to this is probably obvious to experienced folk, which I'm not. Tried searching, no luck.

I want to grab some chroma-caps to pimp out my VCI-400. My concern is that I have heard and read people saying that some chroma-caps just dont quite fit the VCI-400. How much do they "don't quite fit" and why does DJTT not list this device on their compatibility list - does it require too much work so it's not worth it? I mean DJTT have a core product that is basically the VCI-400 with a re-printed faceplate and these caps, so why isn't it listed?

If not then what knobs can/cannot work? Am happy to do a bit of file/sandpaper/dremel work.

Cheers guys - really appreciate any feedback.