I agree. Most modern cars (i.e. 1990's on) don't have bulkhead connectors, but rather run the wire bundle(s) straight thru the firewall. I think they had to do this because there came to be too many terminals. Many today run them to connectors underneath the engine's relay/fuse box. I doubt any of that could be easily or affordably replaced as it can on our cars. My 84 M-B is in-between. They put the fuse box in the firewall, so it serves both that function and as a feedthru. Beside the screw-terminal box shown, look at industrial DIN wiring blocks such as from Wago and Weidmuller. Some are quite small and all are easy to re-arrange. A bit expensive list price, but amazing what you can find surplus on ebay.
