Radio transmitters

I am building a prototype featherweight & planning to use 2.4ghz 4channel walkera (WK-2401) transmitter. The prototype robot will made from plastic & wood, & I'm going to build a prototype by flowing the Rex's robot challenge. But I can't find the receiver for my transmitter, can anyone help me. Here's the transmitter.

Isnt it something like the walkera RX2406 , http://www.rckit.co.uk/receiver-4650.html

The RX that is supposed to go with that is Walkera RX-2402B. I had that one in a RC parkflyer plane ages ago.