I have two 80" sections of aluminum airline track for sale. They are the same item seen here:
https://www.amazon.com/Steadymate-15544-Track-Surface-Mount/dp/B0026FCGF4/ref=sr_1_6?ie=UTF8&qid=1517355415&sr=8-6&keywords=airline+track
I cut 20" from each section, installed it in my van, and then...