Haven't seen it done yet. But if you measure the distance between the inside fan holes (center to center), you may get a hint. If they're 15mm apart, Swiftech, HWL and the newer Feser rads will line up. 17mm, the original feser rads will line up. 23-ish mm, and a TC might line up.
But that's all assuming there's enough clearance around the edges for the rad body and the fittings. Again, haven't seen it done yet.
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