Advanced Auto and Auto Zone have web sites that may be of help. Those expansion tubes are easier to replace than the old expansion valves. The newer stuff uses these spring coils and slip joints with O rings to lock the joints. There's a tool kit to fit over the tubing to pop out the spring coil lock from the joint and then you can pull the two pieces of tubing apart to service it. Always replace the O rings with new ones.
Expansion tubes are inline and usually out there where you can get to them under the hood.....so you don't have to take the glove box out and remove the dash board to get at the expansion valves like in the old days. It's much simpler than that now. The tools don't cost that much either.
If you can do it yourself, you'll save enough to build yourself a motorbike.