Here is an Ebay auction for one used Boss 302 rod and piston by Ebay member "shelcobra" with a starting bid of $95.00:
This is a good used original Ford Connecting Rod for a 1969 1970 Boss 302 Mustang & Mercury Cougar. This has Ford ID number C3AE and is Ford part number C9ZZ-6200-B. It has not been altered or modified. It still has the original piston attached which is included ** Look at the pictures for more details ** fixed shipping charges within the 48 US States 1969 1970 FORD BOSS 302 MUSTANG ENGINE CONNECTING ROD GT MACH 1 HIPO 289 | eBay
-Fred-
This used Boss 302 rod and piston sold May 1, 2023 on Ebay for $128.28 with 9 bids from 2 bidders.
-Fred-