Here is an Ebay auction for a used Hipo air cleaner base by Ebay member "mustang-67 " with a starting bid of $199.00:
This is January of 1966 289 HiPo air cleaner base with breather stamped 6A = January of 1966.....
Rare and Hard to find parts that I've had for years and am now selling in the next couple of days and weeks........ I've owned many of these parts for many years......
Shelby Mustang 289 HiPo Air Cleaner Base W/ Breather - JANUARY OF 1966 | eBay
-Fred-
This used Hipo air cleaner base sold January 23, 2021 on Ebay for $269.07 with 4 bids from 2 bidders.
-Fred-