I was lucky enough to get both risers with my purchase. Apparently any old RTL ethernet card will work with these drivers: https://us.driverscollection.com/?file_cid=24643815567MxliB0EcmMbL38s4

But I can't figure out a way to get the drivers onto the TAM

I am going to borrow a USB CD burner and try it that way, but I'm concerned about the old file types (resource forks! Ahhh!)