Quarter Window Moulding

My '73 Z (MFG date 12-72) has a small upper and lower rubber tab on the front of each quarter window that mates up with the door weatherstriping. I see the later one piece long moulding for sale on E-Bay. Was this a update that will fit my cars quarter window?

My Datsun restore book states "on later models, the metal backed moulding comes off by removing four screws", but I see no threaded holes on my windows.

The seller states they work on all 240Zs, and the small tabs are no longer available.

Thanks, Doug