FWIW, I have scanned the Pontiac sections of a '70 NAPA Exhaust Systems catalog that I found on a swap meet table for a few bucks.
Lists all the standard fitment systems for Pontiac back to the stone age.
(They used to rust out every few years or so when they were just mild steel, we are spoiled ****less now with stainless!)
Been trying to get my scans to the site moderators here they can can be posted.
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