The closest competing jack pad is over twice the price! This one even comes with a rubber pad so you won't scratch your paint when using.
I bought orange so it would stand out, hopefully keeping me from trying to fly away with it still attached.
Here is another style that is very clever, but I'm not certain it would work with a 337 - too heavy possibly?
https://www.youtube.com/watch?v=KBew...re=emb_rel_end