That also makes it unlikely that it's for a heatsink anyhow, because almost all of those old Dell, Gateway, HP, Compaq and other prebuilt systems, and the majority of Intel stock heatsink fans, were mainly 92mm. I don't think I've ever seen one of those older OEM style HSF assemblies that had a 120mm heatsink fan, or if I have it must have been only one or two occasions because I don't recall it. In fact, many of them were only 80mm assemblies for that matter.
In any case, none of this, fan or heatsink, is even remotely useful for anything other than systems from that era anyhow especially since, as mentioned, it's very likely that all of it is proprietary and can't be used with other systems without a great deal of modification, if then.