Hi Wes,
I recently replaced all three (2 front, 1 rear) brake hoses on my 1941 Zephyr with Raybestos BH4497 hoses. I got these from my local auto parts store. They are a wee bit longer than the original hoses (who knows if they were REALLY original?) but seem to work OK.
Braided steel brake hoses are available from
www.inlinetube.com. I got a set of these hoses for my power brake boosted '41 Continental but haven't installed them yet.
If you are planning on doing a brake job on your '48, try to get some asbestos brake linings. The new brake lining material doesn't produce enough friction to safely stop these cars. That's why I installed the Midland power brake booster on my '41 Continental.