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If its a pre-2007 Sure Steamroller, then no it wont as the brake bridge does except a count sunk rear brake bolt. so you will need a front brake to fit to the rear of a pre 2007 frame.
If how ever your Surely Steamroller is post 2007 then yes it will fit, as the brake bridge excepts a modern style counter sunk rear brake bolt.
http://surlybikes.com/info_hole/spew/spew_caliper_brake_reach
all the info is in the link
Cheers Andy
@Johnnyw
Silly question @Dicko but would the back brake fit a surly steamroller?