...anyone know where i can get some dia 7mm rod (prefer s304 either solid or hollow core). I need each of them to be about 440mm in length. Total i need 4 pieces of it.

I'm trying to do some repairs. Thanks.

You can try ordering from 淘宝. I order long SS rods from there every now & then. I am allowed to specify diameter (inner & outer), hollow core or not, grade (yup, even 316 is available) & of course length. If you are ordering super slim ones, the seller will know how to pack with a wood brace to ensure no bending. For air shipment, length should not exceed 1.7m (thereabouts). But if you are very particular about the external finishing, e.g. you need it to be polished, you need to highlight.

From what i know some hardware shops will carry these metal pipes as they are quite common TS