IF u want the current version of these used by a/s...
it may be part #381408
referred to as "push button style lock, black"
any dealer can order this 4 ya,
some might have it IN stock (check with ODM in nc )
one of the a/s salvage/boneyards may have a box of old/used 1s 4 sale.
generically and if u wanna scramble the web,
these are called push button latch
es or self locking latch
es or button lock-latch
es or simply push button
many marine supply sites or aviation supply sites have bits very similar if not exact.
they do come in a variety of diameters and lengths.
mcmaster-carr has similar things
(if u don't have their print catalog the online version is WILD and cool)
i don't know IF a/s still gets this part from southco.
here is one of many examples of a fancier more costly version...
shiny version with DOUBLE push button...