Smallest 2 Pin AC outlet socket
Plugs and sockets are not rated in watts. You need to look for specific voltage and current ratings such as 120V, 2A or 240V, 1A. For the one that you found, find the name and/or number for that type of plug and search for that. Also use other terms for the type of mounting such as chassis mount or thru-hole mount.

Another alternative to the type of plug that you found is a Cinch, Jones, or Cinch-Jones plug. They are rated 250V, 10A and are very compact. There is a 2-pin plug of that type, but there may not be a thru-hole receptacle (socket or female plug). The 4-pin receptacle is available as a thru-hole mount and may be smaller than anything else you can find even though you would have two wasted pins.