LIGHTING GP- 1240464 - Caterpillar

Neither part is serviced, so you go to Column Three to find out what the service replacement is. You then look up these replacements to see if there is any additional information. See Charts C and D.
Column Three confirms that 3V7365 and 3V5918 are good numbers. But before doing anything else, look up the referenced Service Magazine article in the June 14, 1976 issue. This article gives the adaptable serial numbers and some special installation information. You can now CONFIDENTLY order 3V7365 to replace 2V6585 and 3V5918 to replace 2V6716.
Follow this basic method of "tracking" for part numbers whenever you use the NPR.