Micromatic is a company that deals in draft parts. I pieced together the stuff for and existing fridge that I had. The kits are the cheapest stuff normally an you can get better quality parts that can easily have seals replaced if need be. They have all the parts you need, shank, collar pieces, faucets, sanke and euro taps, hose, and other misc stuff.
A keg should last as long as a bottle or longer in some cases based on a freshess standpoint. They are typically exposed to less oxygen because of process and volume. They are typically stored and kept cold from brewery to retail outlet. Plus with most craft breweries the legged beer is the same as bottled or canned. Some places like Yuengling used to pasteurize bottled product and not kegs, might even still hold true, but with most micros, it is exactly the same brew with no additional treatments.
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