▁the ▁mid - 1 9 6 0 s , ▁and ▁C umm ins ▁ 1 6 5 - 2 8 5 ▁and ▁ 9 0 3 ▁ 8 - cy l inder ▁dies el ▁engines ▁were ▁available ▁until ▁ 1 9 7 3 ▁as ▁an ▁alternative ▁to ▁the ▁Detroit ▁Dies el ▁engines ). ▁ ▁Origin ally , ▁the ▁Fl x ible ▁New ▁Look ▁was ▁only ▁available ▁in ▁lengths ▁of ▁ ▁and ▁width s ▁of ▁, ▁however ▁ ▁models ▁later ▁became ▁available . ▁Until ▁ 1 9 6 3 , ▁these ▁bus es ▁carried ▁both ▁the ▁Fl x ible ▁and ▁the ▁T win ▁name plates , ▁with ▁the ▁T win ▁name ▁located ▁in ▁a ▁small ▁o val ▁beneath ▁the ▁Fl x ible ▁shield ▁on ▁the ▁front ▁of ▁the ▁bus es ▁( T win ▁Co ach ▁had ▁been ▁a ▁manufact urer ▁of ▁trans it ▁bus es ▁as ▁early ▁as ▁ 1 9 2 7 ▁and ▁sold ▁its ▁trans it ▁bus ▁product ▁line ▁to ▁Fl x ible ▁in ▁ 1 9 5 3 ). ▁In ▁ 1 9 6 4 ▁and ▁ 1 9 6 5 ▁Fl x ible ▁produced ▁a ▁sub urban ▁model ▁meant ▁for ▁longer ▁distance ▁highway ▁routes , ▁and ▁these ▁bus es ▁were ▁equ ipped ▁with ▁all ▁forward - f acing ▁high - back ed ▁seats ▁and ▁overhead ▁lug g age ▁ra cks , ▁but ▁lack ed ▁a ▁rear ▁exit ▁door ▁and ▁st ande e ▁windows . ▁Air ▁condition ing ▁was ▁an ▁available ▁option ▁on ▁all ▁models , ▁and ▁in ▁most ▁cases ▁was