Hi: Just picked up my first road bike, sold without seat. Figured i could swap a saddle a/o seatpost off my MTB or hybrid, but it looks to be of marginally smaller diameter-- other seatposts I have won't fit in-- and the top is not clamp style, so I can't just attach saddles I have to it. The post says SR on it. Bike is a Univega Viva Sport ($20!!!-- post in Univega appreciation thread to follow).

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Does the post just need hardware for a seat with two rails underneath to attach to, and if so, can anyone tell me what that hardware is / where to find?

Or is this style post for some particular kind of seat that I would need?

Any info on it appreciated. Thanks.