How to confirm size of throttle body

Just got TB, pretty sure it's a 48mm, but I want to check. I thought there was supposed to be a 48 or 52 engraved, but I cant find it.



If any of these help:

The airbox side hole is 62mm and the engine side hole is 56mm. There's an embossed "04" (definately 04, not 48) and the vale has a 6 engraved on it.



Edit: Jst read somewhere that only the 52mm has the emboss. So I presume it's definately 48mm

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