https://www.summitracing.com/parts/otc-7394/replacementparts
here is an OTC puller that shows complete unit

Good news is, I put a call in to the guy who is responsible for getting the building cleaned out by the end of the month. He found the threaded shaft and donut and will put them aside for me until next week when I can pick them up.
The parts were steel as was suggested, and he only remembered the two jaws but I will make the effort to get the other parts and another jaw as this is something I might use.
Misc.: Mack valve lifter tool, Bonney pliers, Snap On punch, Blue Point screw starter/magnet, Vlcheck pliers, Matco screwdriver, Indestro alligator wrench, and a puller leg.
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Good work steaks&anvils!
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