Standard 6 bolt 160mm disc brake rotor

I just measured it and the old one is actually 163mm - does that make it a 165 or a 160?

I can't go any larger than what's already in there so don't want to risk a 165 if it isn't that...??? The old one is knackered which is want to replace it.

Anybody any ideas?
 
I've got an idea.

I've got a 160 (Deore) and a 165 (Tektro I think). I send you them both and you send me one back wrapped in a ten pound note?
 
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