Can You Identify this frame from the numbers?

Hey guys, got a frame sitting in the garage for a kz900/1000, just trying to identify it for year, model and such.

frame number is Z1F-091491, under that is a 7 75.

i checked in the kz model history on here and the numbers say 74 z1a, so iunno.

lemme know wut ya can figure out

KZ900 - 1976 model

k thanks, that a positive answer lol? the father in law go it in a parts lot and he was told it was from a 77' 1000, but i figured that date on there meant otherwise. he hadnt even looked at it, it has been up in the garage for a while