Idk if these two have been recommended but I think they kind of look similar to the sketches and they aren't on the ruled out list.
Carlene Tengelson disapeared in 72 at 16. She disapeared during her first time driving on her own. She has the height and was still in the same age range, she would of been 21.
http://www.doenetwork.org/cases/2837dfga.html
Diane Schulte disapeared in march of 77 and I think she looks the most similar, but her height is listed at 5'5. To me she kind of looks like the Jane doe and by the looks of the picture her hair seemed to be in the same style.
http://www.doenetwork.org/cases/1034dfid.html
Diane Schulte was ruled out by dentals. Please see additional rule out list upthread (page 12) from LE.
Circumstances with Carlene and the fact that she had braces when LKA make it more unlikely than not, IMHO.