You can get either type of radiator - if you go for one with a rad cap you will need to bend your metal pipe slightly (if you don't get a new one with the radiator) and fit a T-Piece to join the radiator overflow into the existing overflow pipe (or you could put a second hole and pipe into the overflow bottle)
You can see mine here - this is a blob eye radiator in a bugeye:
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2005 Spec B 6MT - KiDO tuned (~270Bhp)
Custom exhaust - Cosworth filter - Samco Intake - Tints - Bilstein B8/B6 & STI springs - SuperPro ALK - Whiteline positive shift kit, rack mounts, rear adjustable camber bushes, front ARB mounts & strut brace, 20mm rear ARB with AVO mounts, - Hardrace Gearbox and pitch mounts - Prodrive PFF7's - Front Brembos - Kenwood CarPlay - 1/2 carbon grille - STI front splitter