GENERAL INFORMATION Continued When using the dimensions and other data shown in the Description Column the Parts Manager should be guided by the following 1 length overall refers to the total length of a part measured over the longest dimension An irregular shaped piece is measured over the longest dimension regardless of contours and bends 2 dev length refers to the total length cf a Rart such as a tail pipe or gas pipe measured as though the part were straig tened out This measurement can be taken cn formed piges by using a string to follow the contours of the pipe and then measuring t e length o string used 3 I D refers to the inside diameter O D refers to the outside diameter O S refers to oversize U 5 refers tc undersize To locate the listing of a Part determine the model vehicle and refer to the book under the Group Number identifying it which may be determined by using any of the following three 3 methods 1 Consult Alphabetical Index at front of bock which lists parts by noun and descriptive names and refers to the exact Group Number where all parts of similar kind may be found If name of desired part is not really found in the index a correlated Part Name will suggest approximate locatien 2 Consult Illustrations on which Group Numbers and Noun Name are shewn which will refer to the part or assembly wanted On illustrations where both left and right part numbers are listed the first number will designate left hand side 3 Consult Numerical Index if a Part Number is known and use its Group Number to locate a similar part or be directed te the approximate location of correlated parts The column headed NO USED indicates the number of pieces required The term AR means AS REQUIRED IF BODY IS NOT OF GENERAL MOTORS MANUlF i CT URE PLACE ORDERS DIRECT WITH THIE MANUFACTURER WHOSE NAME APPEAFTS ON THE BODY NAMEE LABEL 1991GENERALMOTORSSERWCEPARTSCWEHAUONS TTRUCK 52G 1 91 s