Are you looking for a standard cosworth splitter or any splitter that can be cut to fit?
I think those Renault ones look
really nasty tbh but everyone likes different things I guess. You can still get the standard ones, alternatively you could opt for a saph rs500 splitter, rouse, or a Renault one....
Best quality aftermarket splitters I've come across are made by Ian Heron, about £150 ish from memory.