Here is an Ebay auction for a group of 13 NOS C2DZ 6A529 A rocker arm adjustment nuts by Ebay member "dreamer397" with a Buy-It-Now of $25.00 or make offer:
This listing is for a set of 13 New Old Stock (NOS) valve rocker arm stud nuts for Ford engines produced between 1963 and 1969.The parts are specifically designed for 260, 289, High-Performance, and 302 cubic inch V8 engines.The nuts are 3/8" - 24 Hex locking style, described as brand new in their original packaging.
1963-1969 Ford Mustang Shelby Mercury NOS 260 289 Hipo 302 ROCKER ARM STUD NUTS | eBay
-Fred-
This group of 13 NOS C2DZ 6A529 A rocker arm adjustment nuts sold August 2, 2026 on Ebay for $25.00.
-Fred-