GENERAL INFORMATION A 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 of a Eart such as a tail pipe or gas pipe measured as though the part were straig tened out This measurement can be taken on formed pipes by using a string to follow the contours of the pipe and then measuring the leng h of string used 3 I D refers to the inside diameter O D refers to the outside diameter O S refers to oversize U S refers to 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 book 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 loca ion 2 Consult Illustrations on which Group Numbers and Noun Name are shown 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 The column headed NO USED indicates the number of pieces required The term A R means AS REQUIRED The asterick sign to the left of the price indicates there is more than one item in a package IF BODY IS NOT OF GENERAL MOTORS MANUFACTURE PLACE ORDERS DIRECT WITH THE MANUFACTURER WHOSE NAME APPEARS ON THE BODY NAME LABEL 1992 GENERAL MOTORS SERVICE PARTS OPERATlONS LT TRUCK 53P 9 92 as