To make dropdowns uniform width:
.wrapperAttribsOptions select {width: 15em;}
Since I can't see the page live, I don't know any of the attribute ids to give exact individual rules. All of the dimensions are guesses since I can't test them on your page. Adjust to suit.
Code:
#wAttrib[Frame Conversions] {width: 49%; height: 13em;}
#wAttrib[Seat Height] {float: left; width: 49%; border: none;}
#wAttrib[Seat Height] h3 {font-size: 1.1em; color: #0000ff; width: 15em;}
#wAttrib[Back Height] {float: left; width: 49%; border: none;}
#wAttrib[Stretcher] {float: left; width: 49%; border: none;}
#wAttrib[Footrest] {float: left; width: 49%;}
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