Airstream shocks, since mid 1968
models, are horizontal. However, they work vertically equally well.
Vertical shocks, of any kind, will not work horizontally.
The current price of Airstream shocks from some parts stocking dealers, is much less that many vertical shocks.
Also, we have had numerous reports from customers that used the Monroe gas shocks, that they experienced shearing of some of their shock studs.
Why in the world, someone is looking for a substitute for the cheap Airstream shocks, is a HUGE mystery, AND a big gamble.
Save yourself from possible damage to your Airstream, and use the shocks that Airstream has been using for over 48 years, with zero problems