[ModelA29]

I think the rubber parts will need to be heat cured so you'll need metal molds. Lots of youtube videos on making small molds. Plaster and lost wax may work well for a small run of these parts. For 100s you'd want to invest in a permanent mold. If you can find who was making the repops they may be willing to sell the tooling if continued production is no longer profitable for them.