You can use any 10 speed chain you want - Campy, Shimano , SRAM - take your pick. As for length, you have to adjust that yourself. Chain length must be bike mechanic's most mysterious subject. It's almost a daily thing.

To insure that you get the maximum wrap capacity from your RD, set the length with the chain installed through the RD as normal, in the little ring and smallest cog. Make it as long as possible without hanging loose or rubbing the upper chain guide on the RD cage.

Others will suggest the big/big method, skipping the RD and adding 1 inch to the length when the ends are brought together. Tha works too, but can give ambiguous results when the end that come together can't be joined. Then you add 3 links or 1-1/2 inches. It also suggests the shortest length unless the cassette you're using has the largest cog size the RD can handle.

I read lots of post where someone used the big/big method and needs to lengthen a chain when they want to switch from a 12-23 to a 12-27. The little/little method avoids that problem.