I was completely shocked by an ebay seller lately that was selling the black plastic insert (called by Nissan as  an escutcheon) behind the door handle.  This  seller was asking $130 for 1 right and $130 for 1 left.

The part number was shown in the ad, so I went to NissanPartsDeal.com and searched for the part number.  The site showed that it was available for $5.58 each for either right or left. Apparently, this part was

being made again. Also MSA was selling for more reasonable $8.18.

Also, I found the window crank available for $28.97 each plus shipping which MSA was selling at a reasonable $38.87

I wonder where we can find more parts number to search for?

I believe this is what you are looking for.      http://www.carpartsmanual.com/datsun/Z-1969-1978

Or just download the microfiche here:  https://www.classiczcars.com/files/category/2-microfiche/