Need help on correct linkage.. who makes it

Any good 14” open element air cleaner will work fine. The stock 273’s look neat, but I like the stock look. You can out flow stock air cleaners, I did on my stock 340 housing, but that is a more race than street, moderately serious effort motor. My AFR would take a dive at higher rpm’s. Tried a 14” open element and the issue went away. Had to modify my base to get more air in. On a 68 340, you really only have a small finger size gap around the bottom. Also I have run the bracket picture on my current eddy AVS and a mighty demon 825.