1939-53 GMC Master Parts Book shown below in clipboard01.jpg The 607306 part is used on 150 & 250 CC models, which is 1941 & 1942. There are no listings for 1943-45. 1946 would be EC models, which used part number 2266752. That part was used through 1952.

47-54 GMC Master Parts Book has the similar info, with 3708866 replacing 607306 as shown below in clipboard02.jpg.
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Clipboard01.jpg (16.62 KB, 15 downloads)
Clipboard02.jpg (8.32 KB, 16 downloads)

'57 GMC 102, Original 347 V8, HydraMatic, 3.08 rear gear, added A/C, disk front brakes, HEI, AFB carb, '98 Honda Black Currant paint. T-boned and totaled 10/12
'52 GMC 152 Stake Bed, Original 228, SM420, added A/C, HEI, disk front brakes, '67 Chev 3.55 rear gear. Gets used as a real truck.