1/4" 'vinyl' (pvc?) tubing from the hardware store for the brakes. The barb on the nipple measures about .293" -- between 7 and 8 mm. The clutch is smaller, and the Autozone barely-a-bottle-barely-a-magnet option had good sized tubing for it.
For today, I simply wanted to replace the old fluid in attempt to save the system from further aging, and flush it before I start with new components. I started with a turkey baster to clean the reservoirs and add some fresh corrosion inhibitors with new DOT 3. However, the brake MC was leaking fluid in the cab, and the slave cylinder wasn't about to wake up from its slumber without leaking either. I'm looking forward to seeing if there is any good cast iron that can be honed. I really don't know the last time this truck was driven. I wonder if the hardlines are toast on the inside? One front wheel cylinder drained the front reservoir almost completely, and the brakes were flatline when I got the truck. The clutch was operable at the time of purchase.
Bottle up and hose hoop above bleeder worked fine, but I wasn't really trying to drive out much air.
Even on a warm day like today, it is cold.