yuk yuk! looks like the u13 alty-bluebirds were around from 1991-95, and it wasn't the high roofline they disliked because subsequent bluebirds were almost the same height (but 40mm shorter). here are links to some pics of the u13 hardtop:
http://www.ridhaa.com/photo/1007f.jpg
http://www.ridhaa.com/photo/328f.jpg
http://www2.ocn.ne.jp/~sanshu/seikyo...u/bluebird.jpg
here are links to pics of the u14 bluebird:
http://www.geocities.com/mvt9003/nis...ebird1-2-1.jpg
http://www.geocities.com/mvt9003/nis...ebird1-2-2.jpg
and finally something called the bluebird sylphy (qg18de powered, came out late 2000):
http://www.geocities.com/mvt9003/nis...luebird3-1.jpg
http://www.geocities.com/mvt9003/nis...luebird3-2.jpg