You didn't say much about their condition but if they're both in good condition that was an excellent price. The 3.55 suregrip is worth that alone if in good shape.
the shape...Ill say this...both could go under my car as is...no paint nothin....of course I'll prolly paint the rearend blk just b/c..but not rust nothin..tellin ya I feel I pretty much robbed this dude! I should judt give him his money back........lol