You can try here: http://www.classictube.com/ Or if originality isn't important, you can use teflon push lok hose and go through the frame.
Classic tube has the correct pattern. See Babeola's post here: http://www.v8buick.com/showthread.php?t=93606&page=2 Jimmy mentioned 'Just Right' I never heard of them..... maybe he meant 'Right Stuff'? BTW, if you're using a ST400 trans or a non-stock radiator, the stock lines may need some customization.