It's dicey with a
120cm dish, so I'd say be prepared to be very disappointed using a 90cm dish.
You will need to rig up a LNBF holder for 90cm dish, I dont think the 120cm large LNBF holder will fit the 90cm dish.
You can find these C/Ku LNBFs on the internet at another vendor.
This thread might help you find what you are looking for:
http://www.sadoun.net/forums/install...ghlight=BSC621