Stern replacement vents 86 Supra

[jbousman88]

Does anyone know where you can buy a type of replacement vent that goes for the blower on the rear of the older supras? I have ran across a few on here that have ones that appear to be steel of some sort

[middlegriff1]

greatlakesskipper.com has them

[crystal waters]

there are 2 kinds - round face or square face. make sure you order correctly so screw holes line up on new ones.
also I believe there are two sizes measured by width between screw holes so again ensure you get the right ones.

[Fuscanini]

From what I can gather, they are thru vents rather than flush vents. I found some replacements online. Does anyone know if they are they 3" or 4" vents? (i'm a ways away from the boat so I can't measure)