one of these threads, that didnt start as a cop car topic, has a couple A38 fusie fender tags/buildsheets.
my observations before that were same as yours .. L, M, or H second VIN digits, NO A38 but YES Y39 and often a second "special handling" tag.
Sanow and Bellah's book called out A38 with Plymouth starting in 1971 -- that started a big argument to my recollection in one of those threads I am recalling.
Another has about 15-20 "F" codes (spotlights, welds, wiring harness for roof lights,single keys, etc). where we chipped in and provided what we knew .. until someone chipped in with the mother lode.
i searched and didnt find any of these threads but they're out there. maybe someone else knows or can search better than me?