Hello. So there are two options here.
Option One is to find the same battery that came originally installed in the vehicle. If you can find the same (I think it was the VARTA brand in mine) then no need to make modifications. It should fit right away.
Option Two: In my case, I was having trouble finding the exact same battery due to availability issues. The battery supplier was asking for a few days to get it from Lahore Warehouse etc....as i needed my vehicle to be operational quickly, I opted for the Hankook brand. The only problem was, the bottom tray was slightly small for the battery size. So I asked the battery supplier to make the slightest modification by cutting off the wall of the bottom tray from one side only. He did that easily with a simple blade (the bottom tray is made of plastic).
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I guess you may also have a Third Option which would be to try any local battery brand. Just check the terminal sizes. Maybe this could also fit in the tray without any modification. There is one issue though...the moulting screws/clamp at the base (seen in the pictures) requires the base of the battery to be sloped. I don;t know if you can get a local battery with this kind of sloped base.
