What diff have I got?

[silver_ae]

Hey, I was wondering if someone can help me. I'm sure it's a t series but what I'm confused about is that it's disc brake and has 24mm axles. I've researched and I can't seam to get the same answer. On some forums they say that kouki diffs have 25mm axles and on other they say that they have 24mm axles and that zenki axles have 24mm and on other forums they have 23.6mm (or somethink like that). So what I want to know is that what diff I have as I need a new axle. So if anyone has experince with this, your help would be good.