According to the FIAT on-line parts lookup the Super A and Super C engines take the same connecting rod, 30926DFXA. It may be possible that one of the engines had different connecting rods swapped in at some time in the past, or has a replacement engine.
If you read closely, the O.P. is talking about extra metal ABOVE the connecting rod. I take it to mean one rod has an extra metal protrusion similar to the rod in this photo:
If that is the case, and the center-to-center length between the bores is the same, the rod will works just fine in his low speed engine, or the extra metal could be ground off.
Previously, I advised him to take the rods to an automotive machine shop and have the center-to-center length checked,to do a quality repair the rods need to be checked anyway.
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Today's Featured Article - Restoration Story: 1929 McCormick-Deering 10-20 - by Randal Simmon. On July 4th 1998 my dad and I was sitting on the front porch when he said that he was going to sell his two 10-20's to a junk man. He said that the junk man was going to give him $500 for both of them but he hadn't received the money for them yet. So I went into the house and wrote him a check for $500 and bought them myself and said now they are mine. He had bought them about five years before thinking that he was going to restore them himself. After five years sitting in the barn, he changed h
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