The early 240Z had handed dove tails for the doors, a left and right sided fitting were required. Part numbers R 80530-E4101 and L 80531-E4101. https://www.carpartsmanual.com/datsun/Z-1969-1978/body-240z/body-side-trim-side-window/62 On later cars there were replaced with a symmetrical part that fit on either side. 80530-N3400

Biggest problems with the early ones were the tabs where the screws went through breaking off. Replacement factory parts haven't been available for years.

Fortunately I have a set of unbroken originals which we modelled up and reproduced in aluminum. We added an extra 1mm around the screw holes to prevent the cracking and breaking. Just picked up the first samples to fit check and they work just like the originals. The original one is on the right, you can see the slight increase in thickness around the screw holes on the left one.

Also modelled up and replicated the original plastic grease reservoir for the steering rack. I'll post details in a separate thread.

Edited October 22, 20251 yr by SpeedRoo

I'm happy with how the dove tails turned out so I'll go ahead and have a batch made up if anyone needs them for a restoration. Just sourcing the right JIS screws.