I'm confused as to why you doing these things yo. A little research will go a long way.
DOT 5 fluid is NOT compatible with the DOT 3 Y12 system!!!!! If you don't want your brake system to fail, flush immediately and refill to DOT 4. You definitely need to get a competent mechanic who can advise you properly.
If your system had the 9.5" rotor, an option would be to use the 5429 caliper (if you didn't already have it) with a slotted 10" rotor at about $320 a side (maintaining the 6" hub) - carry your old rotor before you buy.
The steel braided lines you can get made by Trinidad Hose...you just have to walk with your old lines to use as a reference, because they need to confirm the types and sizes of the fittings.