Serials of the P-38J/F-5B were as follows:
42-12867/12869 Lockheed P-38J-1-LO Lightning
42-13560/13566 Lockheed P-38J-1-LO Lightning
42-67102/67311 Lockheed P-38J-5-LO Lightning
42-67312/67401 Lockheed F-5B-1-LO Lightning
42-67402/68191 Lockheed P-38J-10-LO Lightning
42-68192/68301 Lockheed F-5B-1-LO Lightning
42-103979/104428 Lockheed P-38J-15-LO Lightning
43-28248/29047 Lockheed P-38J-15-LO Lightning
44-23059/23208 Lockheed P-38J-15-LO Lightning
44-23209/23558 Lockheed P-38J-20-LO Lightning
44-23559/23768 Lockheed P-38J-25-LO Lightning
The serial numbers of the P-38L were as follows:
44-23769/25058 Lockheed P-38L-1-LO Lightning
44-23059/27258 Lockheed P-38L-5-LO Lightning
44-53008/53327 Lockheed P-38L-5-LO Lightning
44-53328/54707 Lockheed P-38L-5-LO Lightning - order cancelled.
43-50226/50338 Convair P-38L-5-VN Lightning
43-50339/52225 Convair P-38L-5-VN Lightning - contract cancelled.
http://www.joebaugher.com/oldseriesfighters.html
http://www.wwiiaircraftperformance.org/p-38/p-38.html