What year for 58/15s in hollowbody ii piezo?

[stompbox59]

Hi! New member here. What year did PRS move from the 58/15 set to the 58/15 LT set in the hollowbody Piezo ii? Seeing that the LT’s seem to have come out in ‘15 but i am also seeing ‘16 model hollowbody ii piezo’s that look like they have the 58/15’s instead of the 58/15 LT’s. Thanks for any help!

Q