Any LNB(F) (LNB with integrated feed horn), which has a local oscillator frequency of 10.7GHz (10700 MHz) will be perfectly adequate.
Having said that, buy one of the better known brands, such as MTi, Strong etc.
There are many on E-bay to choose from at very low prices.
Don't forget to adjust the skew correctly. (If you don't know how to do this a simple SEARCH will lead to posts explaining how.