What color interior do you have? I have one of the Autometer Vent Cages I am debating parting with and if If you are ok with it having grey vanes in the vents, you can have it for $30 shipped.
You can see it in this picture. Its actually black, I just have it flipped around to the bare metal side. The black side is mint though. Also have 6 brand new stainless allen bolts to hold it all together. The black ones that Autometer supplies started getting a little oxidized/corroded.