Front brake line fittings

Hi everyone! So I was changing front brakes (calipers, rotors and pads) and also decided to go with StopTech Stainless Steel Brake Line. All went smooth, except brake hard line fittings. I stripped the thread on those bolts while trying to remove the stock brake lines. WD40 didn't help, the fittings are rusty as hell :run:

#11 (I know 11 is the whole hard line, but that's where this fitting(bolt) is)
Attachment 521482

Here's the pic of the actual rusted fitting:
Attachment 521490

So I had to leave the stock brake lines for now.

Question: how do I remove those? Rusted badly + stripped the thread on the bolts. Any ideas? Is there any replacement for these fittings?

Thanks in advance

Attached Thumbnails

   

Front brake line fittings