Headset advice (interpretation)

Hi,
Looking into buying a frame http://www.planet-x-bikes.co.uk/i/q/FRP ... s_frameset
This claims suitable headset to be 'FSA "No.42 ACB/MT"'. This brings up a £70 headset which seems quite expensive, so what other headsets would work with it & how do I tell?
Thanks.
Looking into buying a frame http://www.planet-x-bikes.co.uk/i/q/FRP ... s_frameset
This claims suitable headset to be 'FSA "No.42 ACB/MT"'. This brings up a £70 headset which seems quite expensive, so what other headsets would work with it & how do I tell?
Thanks.
FCN 9 || FCN 5
0
Posts
so any integrated 1 1/8 top bearing and any integrated 1.5 lower bearing.
Parktools :?:SheldonBrown
Thanks.