People use the stock lines with those calipers.
This might help with identifying the model the caliper came from and the appropriate pads.
www.gixxer.com
Photos of your calipers would help others help you.

Braided Stainless Brake Lines
Adding steel-braided brake lines to your motorcycle is one of the biggest performance bangs-for-the-buck you can get on a motorcycle. The crew from Galfer Performance Braking Systems explains how we...
www.adventuretech.biz
This might help with identifying the model the caliper came from and the appropriate pads.
Tokico calipers 6 or 4 pot
Hi, I own a GSX1400, and thought gixxer owners might be able to help me with a question- You are all familiar with the 6 pot Tokico calipers fitted to the 1400, all the busas up to recent, the TLs, and the 2001-2002 gixxer. the thing is, are they as good as the 4 pot Tokicos fitted to the later...
Photos of your calipers would help others help you.