76LTD:
Looks like bike is mostly stock. Your pipes look original from the the photo, and those original 4x2 Jardine pipes are RARE.
Your seat is correct, but has been re-upholstered. And you're missing the grab rail behind the seat. Those LTD grab rails are taller than the Standard KZ900 rail, and they are almost always missing. If you have the rail in your misc parts box, HANG ON to it. They are really hard to find.
You're going to have a fine bike when you're done. Start a post in the Project Forum so we can watch your restoration.
'76 KZ900 LTD (Blaze)
'96 Voyager XII (Dark Star)
'79 KZ650 Cafe Project (Dirty Kurt)
Greensboro, NC