410s had front drum brakes, but most online parts places don't have a listing for available brake shoes. Autozone did, however what they sent was a box of rear brake shoes, so that didn't help. The 1500 Roadster also had front drum brakes and after agonizing and comparing photos from Datsunparts.com to what I have on the car, I eventually ordered a set. It was a gamble of $75, but what was I gunna do, run around on 1mm of front brake shoe material for the next 50,000 kilometers?
New shoes. A real PITA to R&R them (those orange springs are very stiff), but I managed with only minor sweating and somewhat-minor swearing. The adjusters are much easier to work with than the test/retest adjusters on the rear.