TRIUMPH T21 PARTS BOOK  No1  FOR 1957 AND 1958  MODELS. FROM ENGINE NUMBER 21-H1  THIS PARTS BOOK COVERS T21-3TA UNIT CONSTRUCTION  TWINS WITH FULL BATHTUB PANELS.  THIS IS AN EXCELLENT COPY OF THE ORIGINAL PARTS BOOK WITH CLEAR PICTURES AND PARTS NUMBERS A VERY USEFUL PARTS BOOK FOR THESE BIKES. MY TRIUMPH PARTS BOOKS ARE PROVING TO BE THE BEST AVAILABLE PLEASE SEE MY FEEDBACK ON THEM. ANY QUESTIONS PLEASE EMAIL . 

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