It's not like you have a bunch of choices. I think Vesrah and EBC might still make them, and I see some old stock stuff at swap meets occasionally. If OEM is available I would use them, aftermarket ones are fine too but my experience is that the shoes need some major radiusing to fit - and work - correctly.
The radiusing is quite important - the brake shoe radius has to match the drum radius to get good braking. I have done this myself by gluing sandpaper in the drum and running the motor while applying the rear brake. A good brake shop should be able to do it too, but finding one that still remembers how and that has the machine in working order is pretty difficult now that disk brakes have taken over the car world... worth trying though since the job is a bugger to do at home and quite cheap at a shop. Any truck brake shop has the machine and skill to do truck brakes but unfortunately our tiny brakes don't fit on the machine.
