I just did a bit more research and I think the only rads that will fit is the Black Ice GT Stealth or Alphacool Slim rad. Somewhere in the 29mm range.I have an xspc 6 port 240 rad. 35mm. It might get a tiny bit wider with plugs on one side depending on what you use to plug the holes you don't need. Link is in my sig. Rad is barely used just dusty.
Thank you for the advice. The St30 and the GT Stealth are the only two rads that would fit. The ST30, might be tight, but nothing a little hand pressure can fix.pm'd ya, also the best thin rad imo, is the alphacool st30 it's 30mm with a low fin density.
Used one in a hadron air case with some slim rads modded to sit inside the cowling
Of the rad and I got great results from it