Should be easy enough to make your own.You can buy rolls of brake pipe from a good motor factors you will also need a brake pipe flaring tool.Take the old pipe off and use as a template to make the new one you can use the old unions if they are in resonable condition but new would be better.Refit the pipe and bleed the system
All quite easy if you are mechanicly minded if not it might be best to get a garage to do the job,as its brakes safety is an issue
The best brake pipe is cunifer as it is easy to work with