Paper between hub & drum

[ThreeQuarter]

I picked up a pair of low mileage original ‘67 C10 drums/hubs/spindles (from 57Suburb—thanks Todd!) and ground the rivets to separate the drums from the hubs for the first time since the factory. I noticed there was some thin paper on the mounting face of the hub, between it and the drum. I could see that being helpful for heat transfer and maybe sound/vibe insulation. Anybody ever noticed this on your pickup? Ever try replacing it? I’ve cut a couple of replacements from a thin sheet of paper gasket, just wondering what I should consider before I decide to use them.