Cross referencing:

Analysing the parts books..
In 1967 all A-bodies got 15" Anco push button wipers; But in 1968 A-bodies could have ANCO with two claws (bridges) or Trico with single bridge. The Anco refills for 1967 and '68 are the same.

The B-bodies in 1968 came with more possibilities - the 2 door cars could have either the Trico or Anco 15", same as used for the '68 A-bodies. Whereas the 4 doors and wagons could have a yet different wiper (maybe a 16"?)

Anco had several names for the push button wipers including 'red dot'.
I've seen posted (I think in the FABO thead) that some factory Anco push buttons were black and rectangular. They work the same.
Trico called their version of the system Latch Pin, hence LP series refills seem to be for the Anco push button blades.

edit: The Anco 19 series linked in the first post is too narrow. The U-15 is much closer to correct width, but would need to try one to know if that cross section will actually fit.
Below is from Anco's 2014 catalog: