For some reason I can't see the pictures but if the gas and liquid post on your keg have little pins sticking out (2 on one, 3 on the other I think) then it's a pin lock (coke style) keg and you need pin lock quick disconnects. If it's smooth, it's a ball lock (pepsi style) and you need ball lock quick disconnects. The quick disconnects can come with either a barb fitting or a flare style fitting on them. I just get the barb fitting but honestly I don't know why, it's just what I've started using. You can get them from any keg supply places and 90% of the homebrewing supply places.
Replacement o-rings you can get from any of the keg places and most of the home brewing supply places as well. They come in either a kit or you can buy the components separately and both styles of keg use the same o-rings and gaskets. The other option is if you use the search function there's a thread somewhere with mcmaster-carr part numbers for the o-rings and seals and you can get a whole mess of them for like the same price as a few kits.
