What kind of tubing is used on the back of the astro vents on a 69? I cant find any for sale. What are you guys using? Where do you get such a thing from. I need both sides

I can't tell you where to get it but I can tell you that it is a ribbed plastic duct. I think it is 3 & 3/4 inch diameter so it is an uncommon size as far as finding a replacement from a non automotive source. I did see someone on ebay selling some ducting that was somewhat similar but not exact. If I recall correctly it was for a corvette. You can get some ducting from Home Depot or Lowes that will work for Astro ducting, 4 inch stuff, all depends on if you need it to be correct or not.

Four seasons brand has 3" duct for sure. May have other sizes. A good parts store can get it for you. Carquest, NAPA or someone with a good counter man who will look in the book instead of the computer.

Brand name Murray- AC parts. 3 1/2" part # 278154
4" part # 278153
No 3 3/4" listed.

I think i have some aluminum flex tubing that i have left over from my pellet stove installation, i think ill give that a try