Mick,

instead of a radiator mount that is fixed for 120mm radiators, why not just supply with brackets that will hold from the bottom like this?


the base of it can attach to the case via machine screws and provide a slot at the base so to accommodate for thicker/thinner radiator width.
the fan spacing will allow for 120mm and 140mm radiator placement so long as it is 15mm spacing.

that way, you have ability to use the upcoming 140mm radiators as well as a 120mm radiator of any sizes AND thickness...

yes there will be a gap when you mount fan on top... nothing a simple neoprene washer or two cannot handle...

oh, and one more thing thats beneficial about this bottom rad bracket... less material... less waste = better cost...