windshield vent blocks

[drivingfool]

I saw a while back a mod of installing plastic blocks in every other hole for the windshield air, to diffuse the air better. There was an amazon link in the thread. Can someone help with a link or sizing?
Any info is appreciated, thanks and happy wheeling amigos.

Sponsored

 

[BDinTX]

I believe these are what you're after.
Square Tubing Plug Cap, 5/8 Inch Riccioofy 30Pcs Tubing End Cap Plastic Plugs Chair Glide Insert Finishing Plug Black: Amazon.com: Tools & Home Improvement