Connecting two soho networks using lease

I have two different office locations that need to be networked together. There is already a leased line between the building and I have a few extra line drivers.

I was wondering if I could use a couple of my old pc’s that have nic’s and use something like ” Direct Cable Connection ,DUN,ICS to bridge these networks together. The network is a WIN98/95(NetBEUI) and only used for file/printer sharing.3 pc’s in one location 6 in another.