Yes, there were some early tractor plow bottoms with shins available, but they weren't like the shins that were commonplace later. Many of these shins bolted to the side of the frog. The majority of early bottoms did not have shins.
Later Plow Chief and all Super Chief (available from roughly the mid 50's and later) bottoms had shins that bolted through the front of the frog, just like the moldboards.
But, the vast majority of tractor plow bottoms have like beam-to-frog bolt patterns, which allow the Plow Chief and "modern" Super Chief bottoms to bolt right up to a 75 year old plow. Some of these plows had bottoms changed over years ago if they were still in use as wear parts for earlier-style bottoms became unavailable.
Pics or part numbers would help confirm what you have.
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