Here are some fitment photos and reaction - we had a 3rd party member with a fairly well known Z31 do our test fit for the final prototypes, before green-lighting them for production.
"Installed ASCO Silicone Radiator Hoses!
Very firm fit. They are not excesively tight as if they weren't made for the car. The angles of the hoses are exactly to OE. No strange bending.
They are thicker than OE rubber and are very stiff. They will not bulge under hot pressure.
I had zero issues installing these.
These require 1.75" tbolt clamps. And thats what I ordered from the internet (not ASCO).
What I got was 2" tbolt clamps (58/50). Doh!!
1.75" clamps are roughly 49/43."
