If you want the 1/2", you'll have to email bestbassgear about them. They have them, you just have to ask. For the bridge, go with the cheaper (when you include shipping costs of course).
I've found 80% of my Hipshot gear either on TalkBass or e-Bay. Seems a lot of people buy the upgrades then never get around to installing them. The same holds true for necks, pups, preamps, etc. Just be patient and watch the ads.