Took so time and went through my pictures - focused just on 67 rear splash shields. Didn't want to confuse things with looking at forward splash shields and the running changes associated with those and the half on the front and half of the shield on the back thing
So looking at just the rear splash shields I found the following (sorry none had clear date and plant stampings)
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All 67 Dearborn examples showed that they were
attached to the front of the rear splash shield with staples
Vins covered pretty much the whole production period 1107xxx, 1285xx, 1644xx, 1736xx, 1801xx, 1875xx, 196xxx, 2071xx, 2216xx, 2137,xx
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All 67 NJ examples showed that they were
attached to the front of the rear splash shield with staples
Vins covered pretty much the whole production period 131xxx, 155xxx, 158xxx, 1652xx, 170xxx, 202xxx, 241xxx
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All 67 SJ examples showed that they were
attached to the rear of the rear splash shield with staples (guess I could have looked through the Shelbys also bu figured this was a decent sampling) 1076xx, 1156xx, 1164xx, 133xxx, 1399xx, 1533xx, 1598xx, 1639xx, 1706xx, 1849xx, 1883xx, 2297xx
Choose not to count this one since there was no rubber section attached